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Laser scanning has revealed ancient carvings on the pillars of Stonehenge that are invisible to the naked eye.
The experiment scanned just part of three of the 83 stones that make up the famous prehistoric monument in Wiltshire, UK. The archaeologists, from the Wessex Archaeology and Archaeoptics companies, hope a full survey could provide compelling evidence that Stonehenge was a memorial for the dead, at least at the time the carvings were made.
http://www.newscientist.com/news/news.jsp?id=ns99994288