How a group of primitive people with no modern tools and no written history managed to erect a huge ring of massive stones in what is now Wiltshire, England, remains one of the world's great mysteries. Stonehenge was built between 3000 B.C. and 2000 B.C., most researchers agree, and the site includes the stone ring and a massive burial ground beneath. Early inhabitants of England credited magical giants, huge birds and even the devil himself as Stonehenge's builder. Later, scientific theories largely focused on the druids as architects of the monument, though its intended purpose, as perhaps a calendar, a center of pilgrimage or a place for religious ceremonies, continues to be debated.
Video: The "Secrets of Stonehenge"
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