(Hat tip: ErosArt)
(From it's Wikipedia entry:)
The Cerne Abbas Giant is a hill figure near the village of Cerne Abbas in Dorset, England. Made by a turf-cut outline filled with chalk, it depicts a large, naked man, with a substantial erect penis, typically described as a giant wielding a club. The figure is listed as a scheduled monument in the United Kingdom and the site where he stands is owned by the National Trust.
The figure has been the subject of much study and speculation, but its origin and age are unclear. It is often thought of as an ancient construction, though the earliest mention of it dates to the late 17th century. Early antiquarians associated it, on little evidence, with a Saxon deity, while other scholars sought to identify it with a Celtic British figure or the Roman Hercules, or some syncretization of the two. Archaeological evidence that parts of the drawing have been lost over time strengthen the Hercules identification. However, the lack of earlier descriptions leads modern scholars to conclude that it may date from the 17th century, and perhaps originated as political satire.
Regardless of its age, the Cerne Abbas Giant has become an important part of local culture and folklore, which often associates it with fertility. It is one of England's best known hill figures and is a visitor attraction in the region.