Underground city

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An underground city is a series of linked

The term may also refer to a network of tunnels that connects buildings beneath street level that may house office blocks, shopping centres, metro stations, theatres, and other attractions. These passages can usually be accessed through the public space of any of the buildings connecting to them, and sometimes have separate entries as well. This latter definition encompasses many modern structures, whereas the former more generally covers tunnel systems from ancient times to the present day.

Underground cities are especially functional in cities with very cold or hot climates, because they permit activities to be comfortably accessible year round without regard to the weather. Underground cities are similar in nature to skyway systems and may include some buildings linked by skyways or above-ground corridors rather than underground. Some cities also have tunnels that have been abandoned.^[1][2][3]

Asia

China

• Beijing built an extensive tunnel network called the Underground City (Chinese: 地下城; pinyin: Dìxià Chéng) during the Sino-Soviet conflict, supposedly covering 85 km², falling into disuse in the 1970s. It was opened in 2000 to the public and tourists, but closed in 2008 for renovations.^[4] As of 1 July 2009^[update], all "official" remaining entrances appear to be closed.
• Guangzhou has at least 16 different underground networks.^[5]
  • The largest underground network is in Zhujiang New Town. It connects the commercial basements of over 35 office towers and malls surrounding the Zhujiang New Town Central Park, and extends to Zhujiang New Town, Guangzhou Women and Children's Medical Center, Huangpu Dadao and Huacheng Dadao metro stations. The mall portion under the Zhujiang New Town Central Park alone totals at least 150,000 square metres (1,610,000 sq ft) of commercial space.^[6]
  • In addition there are large subterranean retail tunnels that surround several
    Martyrs' Park, Guangzhou railway station and Guangzhou East railway station
    .
  • Smaller networks of subterranean retail tunnels surround several
    Gongyuanqian
• Harbin has a number of large, multi-level underground shopping areas, originally built for air defense. The largest is at the roundabout intersection of Xida Zhi street and Hongjun street where three levels of markets following streets from four directions meet under the giant snowflake atrium.
• subway station of the same name and nearby office buildings.^[7]
• Nanjing has an underground mall around Xinjiekou metro station.
• Qingdao has two small underground shopping areas, one at the head of the Zhanqiao (pier) and one west of the Qingdao guest house.
• Shanghai has a few underground networks, most notably at People's Square metro station, wherein the line 2 station has a second mezzanine full of shops and Line 1 is connected to a large underground shopping gallery at its south end. Shanghai Science Museum stop on line 2 has a large underground shopping area, known for its imitation goods. Huangpi Road South and Xujiahui stations are directly connected to shopping centers, and the Lujiazui station is connected to the Bank of China tower.
• Shenzhen has quite a few underground shopping malls:
  • Link City (
    Futian and Gangxia stations with surrounding office buildings. The initial sections of the mall used to be an air-raid shelter. It is currently being expanded to Gangxia North station
    .
  • An underground electronics market connecting
    Huaqiang Road, Huaqiang North and Huaxin stations and the surrounding Huaqiangbei electronics markets.^[8]
  • Smaller networks of subterranean retail tunnels surround several
    Luohu, Huangbeiling, and Window of the World
    .
• Wuhan has a number of subterranean retail tunnels surrounding Wuhan Metro stations such as Zhongshan Park, Wuhan Business District, Wangjiawan, Qushuilou, Xudong, Wangjiadun, Hongshan Square and Changgang Road Stations.

Hong Kong

Many

Historical underground cities of Persia include Samen, Nushabad, and Kariz.

• Kish: an underground city by the name of Hidden Pearl was constructed of roads interlinked 20 meters (66 ft.) under the ground. Shops and restaurants are planned to be built.
• Tehran: Tehran has made a series of underground pathways in and around Vali-e Asr Metro Station and is in planning stage to increase commercial activity in newly built buildings in the central part of the city. The priorities for future development are expansion of underground connections around Haft-e Tir Metro Station and Meydan-e Vali-e Asr Metro Station.^[9]
• Isfahan: with the completion of Imam Hosein Metro Station, and Jahan Nama Complex, and their eventual underground connection, there would be an underground complex of a length of 300 m formed in Isfahan downtown area. Also, not underground per se, with Imam Ali Square's street network being dug underground and a large open space plaza being constructed on the top, the plaza is connected through a series of covered bazaar pathways of a length exceeding 4 km, connecting it to Naqsh-e Jahan Square.
• Nushabad: Nushabad has an underground city that served as a refuge during wars.

Japan

• Osaka has enormous underground networks in the Umeda, Namba, and Shinsaibashi districts, in which Umeda alone includes over 1,200 retail stores and restaurants, as well as subway and intercity rail stations.
• Tokyo has numerous networks of connecting passages surrounding subway stations that span a few blocks for commuters. Stations such as Shinjuku and Shibuya have underground shopping malls. Shinjuku in particular has a reputation for being so large and complex that even local Japanese get lost there.^[10] The top five largest underground "cities" (地下街, chikagai) in Japan are all shopping districts:

  

  • Crysta Nagahori in Chūō-ku, Osaka – 81,765 m² (880,111 sq ft)
  • Yaesu Chikagai in Chūō, Tokyo – 73,253 m² (788,489 sq ft)
  • Kawasaki Azalea in Kawasaki-ku, Kawasaki – 56,704 m² (610,357 sq ft)
  • Central Park Chikagai in Naka-ku, Nagoya – 56,370 m² (606,762 sq ft)
  • Diamor Osaka in Kita-ku, Osaka – 42,977 m² (462,601 sq ft)
• Kobe has an underground shopping mall called Duo Kobe that link JR West Kobe Station with Kōsoku Kōbe Station of Kobe Rapid Transit Railway and Harborland Station of Kobe Municipal Subway. Another such mall, called Metro Kobe, links Kōsoku Kōbe Station with Shinkaichi Station located underneath Kobe's old downtown area.
• Fukuoka has the Tenjin Chikagai (ja:天神地下街) underground mall which links Tenjin-Minami Station of Fukuoka City Subway Nanakuma Line with Tenjin Station of Fukuoka City Subway Kūkō Line and Nishitetsu Fukuoka (Tenjin) Station of Nishi-Nippon Railroad.

Jordan

Jordan boasts the city of Petra—"rose-red city, half as old as time"—carved from the living rock.

Singapore

• Extensive underground networks exist around most major stations of the Mass Rapid Transit, such as the one at the Raffles Place MRT station with direct underground connections to 19 buildings in the busy Raffles Place area. Expanding the network is the first phase of a new subterranean network linking the station to the One Raffles Quay and Marina Bay Financial Centre for a complex underground pedestrian network across the entire downtown area. ^{[citation needed]}
• The
  Esplanade - Theatres on the Bay, and other developments in the Marina Centre area. It is also linked to the Esplanade MRT station on the Circle MRT line
  .
• The Orchard Road shopping belt is connected by underground linkways often with commercial space, particularly around the three MRT stations serving the district, namely Orchard, Somerset and Dhoby Ghaut. Plans are also in place to link towards Bras Basah Road into Suntec City, Bugis Junction and Chinatown. ^{[citation needed]}

South Korea

• Myeongdong Station
• It is planned to build a larger underground city in Gangnamdaero, the border between Gangnam District and Seocho District.^{[citation needed]}

Taiwan

Taipei has underground streets connecting two or more metro stations. In addition, there is a large underground shopping mall near the main train station.

• Underground streets around
  Taipei Station: Taipei City Mall, Eslite underground malls, Zhongshan Metro Mall
  , etc.
• Zhongxiao Dunhua
  metro stations.

• Cappadocia contains several historical underground cities carved out of unusual geological formations formed via the eruptions of ancient volcanoes. The cities were initially inhabited by the Hittites, then later by early Christians as hiding places. They are now archeological and tourist sites but are not generally occupied (see Kaymakli Underground City, Derinkuyu underground city, Özkonak Underground City, Mazı Underground City). The latest large underground city was discovered in 2007 in Gaziemir, Güzelyurt. It was a stopover on the Silk Road, allowing travelers and their camels to rest in safety underground, in a 'fortress' equivalent to a modern hotel.

• Istanbul boasts the Roman cisterns, built 2,000 years ago for water storage. It is now a tourist attraction.

Australia

Sydney has a series of underground shopping malls around the Town Hall underground station. The tunnels run south to the George Street cinema district, west under the town hall, and north to Pitt Street Mall through the Queen Victoria Building. The northern branch links Queen Victoria Building with Galleries Victoria, Sydney Central Plaza (which in turn links underground to Westfield Sydney and internally above ground to Centrepoint, Imperial Arcade, Skygarden, Glasshouse and 25 Martin Place). The linked centres run for over 3 km (2 mi). In 2005, Westfield Corporation submitted a development application to link Sydney Central Plaza underground with 3 other properties on Pitt Street Mall and extend the tunnel network by a further 500 m (1,640 ft) or more.

Perth has a small network of underground shopping malls running from the St Georges Terrace entrance to Trinity Arcade to Murray Street Mall.

The small town of Coober Pedy in northern South Australia has numerous underground residences and other facilities. The area was and is extensively mined for opal, and the settlers lived underground to escape the scorching daytime heat, often exceeding 40 °C (104 °F).

Melbourne is said to have the largest underground tunnel system in the world spanning over 1500km, with the clandestine group known as the Cave Clan who meet regularly to explore, vandalise, socialise and map out this network. The vast majority of these tunnels are decommissioned or for stormwater purposes.^[11]

Europe

Bosnia and Herzegovina

• Skenderija is a cultural, sports and trade center located in Sarajevo, Bosnia and Herzegovina. In the area of 70,000 square meters there are multipurpose halls for various sports, concert and cultural venues, and trade areas above ground including square. Underground is a modern shopping center "Privredni grad" (English: Commercial City) with numerous confectionery shops, restaurants, coffee bars and other spaces.^[12][13]
• The Sarajevo Tunnel (Serbo-Croatian: Sarajevski tunel / Сарајевски тунел), also known as Tunel spasa (Тунел спаса, English: Tunnel of salvation) and Tunnel of Hope, was a tunnel constructed between March and June 1993 during the Siege of Sarajevo in the midst of the Bosnian War.

Croatia

• Cellars of Diocletian's Palace, sometimes referred to as the "basement halls", is a set of substructures, located at the southern end of Diocletian's Palace^[14] (now the southernmost part of Split Stari grade), that once held up the private apartments of Emperor Diocletian^[14] and represent one of the best preserved ancient complexes of their kind in the world.^[15]

Finland

• In
  Rautatientori and Kamppi. The Kamppi metro station is integrated with the Kamppi Center (55,000 m² (592,015 sq ft)) long-distance bus terminal, freight depot and internal parking area, all underground. It features a six-storey shopping complex and a central bus terminal for local buses. Together with these, the Forum shopping centre, Sokos and Stockmann
  department stores are all connected together with underground walkways featuring shops and other services.
• Three other subway stations in Helsinki have similar, smaller undergrounds: Hakaniemi, Sörnäinen and University of Helsinki.
• The master plan of Helsinki's large underground city complex is known to be the only one of its kind in the world.^[16][17]

France

• Paris:
  • The
    urban explorers
    , and venues for unauthorized cultural activities.
  • CNIT
    , but enabling access to many buildings of the district.
  • The
    River Seine.^[19]
• Naours: 33 metres (108 ft) below the Picardy village of Naours (between Doullens and Amiens), the 28 galleries (2,000 metres (6,562 ft) long) of an ancient limestone quarry (exploited since the 3rd century c.e.) have long been used as shelter by the population seeking refuge from invaders. Occupied by the Triple Entente forces during WWI, and then used as headquarters by the German Army during the WWII occupation of France, the galleries are now open to visitors.
• Arras: during World War I, the French and British Army built a tunnel system (boves) based upon the already existing adits from a formerly used quarry. Scots and Englishmen used the quarry below the quarter Saint-Sauveur and called it "Glasgow", "Manchester" and "Liverpool". The New Zealand Army (bonded with the British Army) used the quarry for constructing another tunnel system below the quarter Ronville and called it "Wellington", "Auckland" and "Nelson".^[20] Soldiers from these armed forces hid in the tunnels for several days. On April 9, 1917, 5:30 am, 24,000 soldiers sortied from there to encounter German troops.^[21]

Germany

• Berlin: several buildings on the east side of Friedrichstraße, from Quartier 205 (Friedrichstraße 70) northwards up to Galerie Lafayette are connected to each other. Businesses are on both sides of the underground street so that it appears to be inside a building all the time, even when it crosses Taubenstraße underground.

Extensive underground bunkers still exist all throughout the city centre, although they are largely sealed off and closed to the public.

All of the buildings at the large Charité Virchow campus are connected via a system of spacious tunnels. In addition to employee use, particularly during inclement weather, there is also a rudimentary robotic system via which mail and packages are delivered across campus.

• Frankfurt am Main
  : underground shopping malls, called 'B-Ebene' in Frankfurt, of considerable size are found at Hauptbahnhof (central station) and Hauptwache.
• Jungfernstieg
  and Rathaus subway stations and several entrances are connected by pedestrian tunnels, some of them contain shops. There is a direct access to the Europapassage shopping mall.
• Munich: underground shopping mall at Karlsplatz/Stachus. This combines the underpass that leads to the pedestrian area and the entry to the subway system.
• Stuttgart: there is a large underground shopping mall (Klettpassage) connecting the Hauptbahnhof (central station) with the main shopping street, the Königstraße.

Greece

In

• Ancient Rome had a network of catacombs, ancient Jewish and Christian underground burial places near the city.
• many chambers and tunnels beneath the city, including channels and reservoirs for water, and catacombs
  .

• Maastricht: originally a casemate, the kazematten of Maastricht form a 14 km (9 mi) long network of tunnels underneath the western part of the city.^[23] This tunnel network has mainly been used for military purposes. The main construction period of these tunnels lasted from 1575 to 1825.^[23] The newest sections of the tunnel network were dug as late as the middle 20th century, built in the Cold War as a shelter for citizens in the event of a nuclear strike on the city.^[24]
• Caves of Maastricht are a far more extensive, system of tunnels with a length over 200 km (124 mi) and 20,000 individual corridors lies just west of Maastricht; (Dutch: Grotten van Maastricht).^[25] These man-made 'caves' were used as Marl quarries from the 13th century onwards.^[26] In World War II, these caves were used to hide large quantities of paintings from the Germans, even including the Nachtwacht.^[27] In 1944, construction started on a large public shelter that could have housed 45,000 persons in these caves. The project never saw its completion due to the liberation of Maastricht in the fall of the same year.^[28]

Poland

• Centrum LIM skyscraper.^[29]

• Moscow: "Okhotnyi Ryad" (Охотный Ряд) is a four-level underground shopping mall (29,000 m² (312,153 sq ft)) linked to Metro station of same name.
• Moscow Metro 2 is a purported secret underground metro system in Moscow built supposedly during (or from) the time of Joseph Stalin.

Spain

• In Barcelona, there is an abandoned underground mall near Plaça de Catalunya called Avinguda de la Llum, closed since 1990, which had originally been part of a more ambitious project to build an underground city under the centre of Barcelona. Also, some Metro stations or connecting lines in the same station are connected by underground passages over a block in length.
• Legend has that the many caves and tunnels in Subterranean Toledo under the old part of Toledo were connected and were used by occultists.

Sweden

• By walking through Stockholm subway stations and indoor shopping malls it is possible to walk indoor through the central business district, partly underground, from Arsenalsgatan subway entrance (Kungsträdgården station) to Kungsbron (north entrance to Cityterminalen bus terminal), covering a distance of between 1 and 2 kilometres.

Switzerland

• Geneva contains a large underground shopping centre which also acts to connect separate sections of surface shops.
• helicopter pad
  , pharmacies and storage facilities.
• Zürich Hauptbahnhof in Zürich has an underground RailCity shopping mall with full access to the station platforms.^[30]

Ukraine

• Kyiv: an underground concourse extends underneath Khreschatyk Street from Maidan Nezalezhnosti to Ploshcha Ukrainskykh Heroiv. The concourse connects to the Kyiv Metro and to the Globe shopping mall beneath Maidan Nezalezhnosti.
• Odesa Catacombs
  covers the historical center of Odesa and some suburban areas.

United Kingdom

• Corsham, Wiltshire, is the location of the Central Government War Headquarters, code name 'Burlington'. Built in the late 1950s in response to the increasing threat of nuclear warfare during the Cold War, the 35 acres (14 ha) subterranean site was designed to be the main emergency government war headquarters of the UK outside London and safely house up to 4,000 central government personnel in the event of a nuclear strike.
• In London's redeveloped docklands Canary Wharf tube station, adjacent office towers and shopping malls are connected underground. It is also possible to access two stations of the Docklands Light Railway without going outside.
• Dover contains a series of interconnecting tunnels, that honeycomb both sides of the Dover Valley, carved into the chalk cliffs. These date from Ancient times at Dover Castle through to Napoleonic, Second and Cold War installations. The Dover Castle complex is the larger, going at least six levels deep and includes a hospital, troops quarters, offices and storage and channel view points. The southern tunnels are mixed between Napoleonic War-era defences (see Dover Western Heights) and Second World War-era defences, with some seafront air raid shelters still used for shop storage today. Many have fallen into disrepair and are now closed to the public, but many are still open.
• Admiralty Citadel beneath Whitehall, created during World War II, and used by Winston Churchill
  .
• There are extensive underground constructions across Britain, such as Chislehurst Caves, built or repurposed as air-raid shelters during World War II.
• Edinburgh's old town has extensive rooms, tunnels and chambers beneath some areas; of particular note are the Edinburgh Vaults, where overcrowding led people to construct elaborately interconnected buildings in the vaults of the city's South Bridge.
• In Southport, Merseyside, Nevill Street has the remainders of an underground shopping street, which can now only be accessed from the cellars of buildings on the current street, which was raised by one storey from the original level. One end of the underground street ended at the Marine Lake, close to the pier entrance.
• In
  Williamson's tunnels
  included the site of an 'underground house' complete with windows (concealed by work for public opening) and an extant and partially excavated 'banqueting hall'.
• Nottingham has an extensive network of man-made caves, dating back to the Early Middle Ages.

North America

Canada

The cold-winter northern continental climate of much of Canada makes underground pedestrian malls particularly useful in many cities.

• Light Rail Transit
  stations of the downtown core.
• University of Calgary in Calgary, Alberta, has a small system of tunnels and at-ground and above ground ways. It connects almost all buildings on Campus.
• Halifax, Nova Scotia (Downtown Halifax Link
  ), where no point is more than 10 minutes casual walking distance from any other one.
• bus terminal (Réseau de transport de Longueuil
  and other transit authorities), and other areas. It connects 80% of office space and 35% of commercial space in downtown Montreal.
  • The network began as a connection between
    Gare Centrale
    .
  • More than 2,000 shops and 40 cinemas line the passageways. Tourists often visit attractions in the underground city, which is used by an average of half a million Montrealers per day.
  • Eight
    Pie-IX which links venues from the 1976 Summer Olympics
    .
• Ottawa Convention Centre
  .
• Saskatoon, Saskatchewan – On the campus of the University of Saskatchewan a tunnel system connects several of the buildings on campus, this is augmented with overhead walkways that further extend the network.
• MUNnels, a tunnel system, in which all the main buildings are connected, though there are also some elevated walkways
  .
• PATH"), comprises 29 kilometres (18 mi) of walkways and 1,200 shops. It links many important buildings and attractions downtown to six TTC
  subway stations. PATH accommodates 100,000 pedestrians daily, and PATH businesses host the world's largest underground sidewalk sale once annually.
  • The PATH network in Toronto is the largest underground shopping complex in the world with 371,600 square metres (4,000,000 sq ft).
  • Toronto also has a separate, smaller "underground city" connecting several building complexes and two subway stations on Bloor Street.
• Waterfront Station's links with Canada Place and the Sinclair Centre
  .
• Winnipeg, Manitoba, has a smaller (mainly commercial office) area located underground in the downtown core below Portage and Main. Several of the downtown office towers have subterranean entrances to the complex allowing employees and visitors to bypass the downtown traffic and avoid the cold winter temperatures Winnipeg regularly experiences. The system links with the skyway system known as the Winnipeg Walkway. Also the University of Manitoba has tunnels for the students to travel from building to building.
• parking garage, which itself connects to the Homburg Financial Building, and has a separate public entry. Apart from the hotel, two additional office buildings are on top and can be assessed through the mall, a building owned by National Bank, and a building owned by BDC
  .

• tapestries at various locations along the main corridor, and features works from the New York School of abstract modern art from the 1960s and 1970s.^[31]
• Atlanta, Georgia: the "Underground" represents the original surface level of downtown Atlanta; the present streets are raised roadways (viaducts) built in the 1920s. The shopping center Underground Atlanta, taking advantage of the former street-level storefronts, covers six city blocks and includes retail shopping and restaurants. It was begun in 1968 and re-opened in 1989 after a financially forced closure.^[32]
• Boise, Idaho
  : the downtown sector's Capitol Mall Complex consists of a large system of networked tunnels that connect all the state buildings. The tunnels have walkways and vehicle passageways. The underground area boasts a geothermal power plant, a banking system, extensive dining areas, parking, a dedicated mail room for the Capitol Mall Complex and a fallout shelter. The main hall is decorated with art from local artists that was collected over a thirty-year time frame. This collection is not often seen by the public as access is limited. Recent remodeling of the Idaho State Capitol Building has added new underground wings that are linked to the Capitol Mall. These new wings have offices, meeting rooms, and records storage areas and were designed to support the Idaho legislature when it is in session.
• Boston, Massachusetts:
  • Northeastern University has a tunnel network linking thirteen buildings in the center of campus.
  • Harvard Business School in Allston has a color-coded basement tunnel system open to pedestrian traffic.^[33]
• Cambridge, Massachusetts: many of the older buildings of the Massachusetts Institute of Technology between Massachusetts Avenue and Ames Street are linked together by underground utility tunnels.
• Chicago, Illinois: the Chicago Pedway consists of approximately 4 disjointed tunnel systems, the largest covering about 10 blocks, connecting such buildings and transit stations as Metra's Millennium Station, the Chicago Cultural Center, the Macy's (former Marshall Field's) store at State and Randolph, Chicago Transit Authority's State Street and Dearborn Street subway stations, City Hall, and the James R. Thompson Center, along with few residential buildings including Aqua, Columbus Plaza, The Heritage at Millennium Park, the Park Millennium and 200 North Dearborn Apartments.
• Tower City Rapid Transit Station, the central station on RTA's Red, Green, and Blue Lines. The building connects to several office buildings, and also has an enclosed skyway to the Gateway Sports and Entertainment Complex
  .
• Crystal City, Virginia: a residential and commercial area of Arlington County, Virginia next to the Ronald Reagan Washington National Airport, Crystal City features an extensive underground city connecting its hotels, office buildings, and apartment towers and is lined with 173 shops, restaurants, banks, medical, and other services.^[34]
• Dallas, Texas: the Dallas Pedestrian Network has a network of tunnels connecting buildings in the downtown area.
• Dayton, Ohio: the academic section of Wright State University's campus contains nearly two miles (3.18 kilometers) of tunnels ^[35] that link 20 of the 22 buildings. The tunnels were designed to connect the campus without imprinting the surrounding land.
• New Center, features an underground concourse which connects with the Albert Kahn Building, New Center One, and Cadillac Place
  (formerly the General Motors Building) via a series of skyways and tunnels.
• Duluth, Minnesota: the city's downtown sector has an extensive network of skyways and tunnels connecting its buildings, including the Federal Courthouse and Convention Center (DECC).
• Havre, Montana: the city has an underground area, called "Havre Beneath the Streets", that operates as a tourist attraction.^[36]
• Houston, Texas: the seven-mile (11 km) Houston tunnel system is set about twenty feet below Houston's downtown street system and is composed of underground passageways which, with above-ground skywalks, link office towers to hotels, banks, corporate and government offices, restaurants, retail stores, and the Houston Theater District. Only one building, Wells Fargo Plaza, offers direct access from the street to the Tunnel; otherwise, the Tunnel can only be entered via street-level stairs, escalators, or elevators inside a building connected to it.
• Irvine, California: a network of large tunnels running beneath the University of California, Irvine connects many of the campus' major buildings to a central utility plant. These tunnels are only accessible to maintenance staff, although there are also publicly accessible tunnels which intersect the utility tunnels, such as the one that goes between the main Information & Computer Science building and the Engineering Tower.^{[citation needed]}
• Kansas City, Missouri: the city's SubTropolis is a 55,000,000 square foot (5,060,000 m³), 1,100-acre (4.5 km²) underground business complex running along the Missouri River. The space was originally part of the Bethany Falls limestone mine, and was later repurposed for use as a commercial underground storage facility.
• Gopher Way connects most buildings and parking structures together using a number of skyway links and tunnels. A system of tunnels connects state office buildings around the Minnesota State Capitol.^[37] A series of tunnels also connect the Hennepin County Government Center, Minneapolis City Hall, and the United States District Court for the District of Minnesota
  .
• fare control. A series of tunnels connect Brookfield Place (New York City) through the World Trade Center's lower levels, to the Fulton Center
  , forming an underground city with several subway stations and many shops and restaurants.
• Oklahoma City, Oklahoma: the Oklahoma City Underground (formerly the Oklahoma City Conncourse) is a tunnel system connecting nearly all of the downtown buildings in a 20-square-block area. It is one of the most extensive all-enclosed pedestrian systems in the U.S., extending three-quarters of a mile and connecting over 30 downtown buildings via tunnels or skyways. The original tunnel link was built in 1931 and the system was extended in the 1970s. It underwent a $2 million renovation in 2006–2007, after which the Conncourse was renamed the Underground.^[38][39]
• US Post Office is located in the Suburban Station
  section of the concourse.
• Richmond, Virginia: there are a series of connected tunnels between state government buildings in the city of Richmond. Certain passageways are locked off but a good portion of the tunnels are accessible from buildings. The purpose of the tunnels is not generally known; the two most common explanations are that they were built to allow people to move between buildings in inclement weather or that they were built as part of an emergency evacuation plan.
• Rochester, Minnesota: the Mayo Clinic's buildings in the downtown area are interconnected with tunnels and skyways. Other businesses are along the corridors, including a number of hotels that often house clinic patients. It is often called a subway, although there are no underground rails in the city.
• Nazareth College in the southeast portion of Rochester has an extensive underground network of tunnels leading from the dormitories to the major buildings on campus. Rochester Institute of Technology has two tunnel networks linking its residence halls, and its academic buildings, but the two networks are unconnected. The University of Rochester
  has an underground network connecting many of its academic buildings.
• Seattle Underground Tour in Pioneer Square
  takes visitors on a humorous guided walk showing the original ground level of many buildings in that area.

• Vicksburg, Mississippi: during the Siege of Vicksburg in 1863, Union gunboats lobbed over 22,000 shells into the town, destroying nearly all of the town's housing. As a result, over 500 caves were dug into the clay hills surrounding Vicksburg. The Union soldiers later gave the town the nickname of "Prairie Dog Village" due to these caves.
• Walt Disney World, Florida (southwest of Orlando, Florida) has a network of utility tunnels (the Disney utilidor system) used by its employees for transportation between venues, rest areas, staff preparation, and first aid. The main system is under the Magic Kingdom theme park. Other tunnels lie underneath Future World at Epcot.
• Washington D.C.: all of the buildings in the United States Capitol Complex are connected by tunnels and underground walkways, which provide easy passage between legislative office buildings, the Capitol, the Capitol Visitor Center, and the Library of Congress in inclement weather. The tunnels connecting office buildings are open to the public, but those connecting to the Capitol require security clearance to use. Small electric tramways run from the Capitol building to the Russell, Dirksen, and Hart Senate Office Buildings and to the Rayburn House Office Building. The tunnel between the Capitol and the Cannon House Office Building
  displays winning pieces of artwork from the annual Congressional Art Competition for high school students.
• Wellesley, Massachusetts: there is an underground network connecting several buildings at Wellesley College.

Mexico

• Mexico DF
  metro system has many underground pedestrian walkways connecting stations.

South America

Argentina

References