Huge Pre-Stonehenge Complex

 place with historical importance, prehistoric, historical layer / disappeared object

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Huge Pre-Stonehenge Complex found only recently (announced June 2009).

Selected info from this National Geographic article:
news.nationalgeographic.com/news/2009/06/090615-stonehe...

A thousand years older than nearby Stonehenge, the site includes the remains of wooden temples and two massive, 6,000-year-old tombs. At the 500-acre (200-hectare) site, outlines of the structures were spotted "etched" into farmland some 15 miles (24 kilometers) from Stonehenge and was discovered during a routine aerial survey by English Heritage, the U.K. government's historic-preservation agency, which saw "crop circles" which were the results of buried archaeological structures interfering with plant growth.

You can see these circles faintly in this sat photo.

I found it based on the photo supplied with this National Geographic article announcing the major find:
news.nationalgeographic.com/news/bigphotos/49021910.htm...