Wikipedia:Picture of the day/January 2007

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Photo credit: Jon Sullivan

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The Tulip Stairs and lantern, as seen from below, of the Queen's House in Greenwich, England. Designed by Inigo Jones, the stairs are the first centrally unsupported stairs constructed in England. The stairs are supported by a combination of support by cantilever from the walls and each stair resting on the one below. The first reference to the iron balustrade design as 'tulips' was in 1694 and the name 'Tulip Stairs' dates to the 18th century.

Photo credit: Mcginnly

The Great Bath of the Roman Baths in Bath, England, with Bath Abbey in the background. The complex, a grade I listed building, was constructed during Roman Britain, during which time the town was known as Aquae Sulis. It was rediscovered in the 18th century and, as well as being a major archaeological find, it has become one of the city's main attractions. The entire structure above the level of the pillar bases is a later reconstruction.

Photo credit: Diliff

An animation showing how an obliquely cut torus reveals a pair of circles, known as Villarceau circles, named after the French astronomer and mathematician Yvon Villarceau. The circles have no known practical application, but are merely a curious and somewhat unexpected characteristic of the torus.

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The Treasury of Athens is a building at Delphi, the holiest of Ancient Greek sites and shrine to the god Apollo. It was built to commemorate the Athenians' victory at the Battle of Marathon. It is one of a number of such treasuries, built by the various states—those overseas as well as those on the mainland—to commemorate victories and to thank the oracle for advice important to those victories. The Athenians had previously been given the advice by the oracle to put their faith in their "wooden walls" – taking this advice to mean their navy, they won a famous battle at Salamis.

Photo credit: Sam Korn

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A diagram of the basic morphology of a female dragonfly, showing detailed external structure and organisation. The wings in the diagram are raised higher than is usual in most dragonflies. The wings are in an 'inspection' position to allow a clearer view of the body. Generally both sets of wings are held relatively flat and horizontally against the body. This raised position is more common with a dragonfly in flight. The wings have been shown solely to give a sense of proportion.

Diagram credit: WikipedianProlific/Gustavb/Andrew c

In dentistry, a pulpectomy is an endodontic treatment to cure an infection of the root canal. This illustration shows a

Illustration credit: Jeremy Kemp

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Photo credit: Debivort

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Photo credit: Daniel Schwen

Huntsman spiders are a common group of spiders found in Australia, New Zealand, and many other tropical and semi-tropical areas of the world. Huntsmen do not build webs but forage for food - mostly insects and other invertebrates. They do bite if provoked, but the victim will suffer only minor swelling and localised pain, recovering in a day or so.

Photo credit: Fir0002

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Animation credit: John Reid

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Plate XIX of "Studies among the

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Photo credit: Mdf

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Photo credit: Jon Sullivan

A stitched image of the Radcliffe Camera in Oxford, England, as seen from the tower of the Church of St Mary the Virgin. The building, often abbreviated as 'Rad Cam', was built by James Gibbs in 1737–1749 to house the Radcliffe Science Library. After the Radcliffe Science Library moved into another building, the Radcliffe Camera became a reading room of the Bodleian Library.

Photo credit: Diliff

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The Mexican redknee tarantula (Brachypelma smithi) is a species of terrestrial tarantula native to Mexico, but might be found in small numbers in neighboring countries. They are among the most popular tarantulas available in the pet trade, due to their impressive size and striking coloration. An adult female has a body roughly 10 cm (4 in) long, with a legspan of 15-18 cm (6-7 in), and a weight of approximately 15-16 g (0.7 oz).

Photo credit: Fir0002