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Stonehenge excavation

Archaeology students Steve Bush, right, and Sam Ferguson, left, sieve through earth amongst the stones at Stonehenge. (Kirsty Wigglesworth / Associated Press)
Archaeology student Steve Bush is working on the excavation team at Stonehenge. “You could put 10 archaeologists in a room and you’d get at least 11 theories” about the site, said Dr. Andrew Fitzpatrick of Wessex Archaeology. (Kirsty Wigglesworth / Associated Press)
A file picture taken on June 21, 2007 shows the stone circle of Stonehenge at sunrise during a pagan festival. (Carl de Souza AFP/Getty Images)
Druids perform a pagan harvest blessing in 2006 amid the bluestones at Stonehenge. One theory is that the monument was built by Druids for sacrifices. (Carl de Souza AFP/Getty Images)