Lying on the ground near the center of Stonehenge, partially covered by two huge slabs that appear to have toppled over, is a 16-foot-long block of gray-green sandstone. In 1620, noted landscape ...

The Stonehenge Hidden Landscapes team, a cooperative archaeological effort by a handful of British universities, found 20 of the pits altogether, forming most of a circle around the already-known ...

This diagram shows how the Stonehenge calendar may have worked. (Image credit: Image courtesy Timothy Darvill) Additionally, there are four "station stones," as archaeologists call them, that are ...

This diagram shows how the Stonehenge calendar may have worked. The 30 stones in the sarsen circle represent days which multiplied by 12 give 360.

Ancient Scandinavians dragged 59 boulders to a seaside cliff near what is now the Swedish fishing village of Kaseberga. They carefully arranged the massive stones — each weighing up to 4,000 ...

This diagram of Stonehenge shows the ring of Aubrey Holes, at marker 13, where archaeologists have found cremated human remains. Photo: courtesy Adamsan/Wikipedia.

This diagram of Stonehenge shows the Altar Stone, in green, partly covered by two collapsed stones. A horseshoe-shaped arc of bluestones, in blue, bends around the Altar Stone.

Around 4,500 years ago, the famous silhouette of Stonehenge would have looked very different. Writer and archaeologist Mike Pitts digs up clues to the mystery of the circle's long-lost stones.

In contrast, all three of Giza's famous pyramids in Egypt were built roughly between 2575 and 2465 B.C., and construction of Britain's Stonehenge is thought to have started around 5,000 years ago.

Stonehenge casts shadows from the past in this aerial photo taken in 2006. Getty Images. Lying on the ground near the center of Stonehenge, partially covered by two huge slabs that appear to have ...

Around 4,500 years ago, the famous silhouette of Stonehenge would have looked very different. Writer and archaeologist Mike Pitts digs up clues to the mystery of the circle's long-lost stones.