There's some debate about what exactly has been found. The survey team which uncovered the structure said it could be the foundation for a circle of freestanding pieces timber, a wooden version of Stonehenge.
But Tim Darvill, a professor of archaeology at Bournemouth University in southern England, expressed skepticism, saying he believed it was more likely a barrow, or prehistoric tomb.
Darvill did say that the circle was one of an expanding number of discoveries being made around Stonehenge which "really shows how much there is still to learn and how extensive the site really was."
"In its day Stonehenge was at the center of the largest ceremonial center in Europe," he said.
Although antiquarians have been poking around the area since the 18th century, excavations are now tightly restricted. So archeologists have been scanning the surrounding fields and pastures with magnetic and radar sensors pulled across the grass by tractors or quad bikes.
The new structure was found when scans identified a cluster of deep pits surrounded by a ring of smaller holes about 900 meters (a little over half a mile) from Stonehenge and within sight of its famous standing stones.
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http://www.physorg.com/news199027267.htmlWho knew there was still exploring going on there.