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The reason for Stonehenge's construction is unknown.
The mysterious structure of Stonehenge may have been built as a symbol of peace and unity, according to a new theory by British researchers.
During the monument's construction around 3000 B.C. to 2500 B.C., Britain's Neolithic people were becoming increasingly unified, said study leader Mike Parker Pearson of the University of Sheffield.
"There was a growing islandwide culture - the same styles of houses, pottery and other material forms were used from Orkney to the south coast," Parker Pearson said in a statement, referring to the Orkney Islands of northern Scotland. "This was very different to the regionalism of previous centuries."
By definition, Stonehenge
would have required cooperation, Parker Pearson added.
"Stonehenge itself was a massive undertaking, requiring the labor of thousands to move stones from as far away as west Wales, shaping them and erecting them. Just the work itself, requiring everything literally to pull together, would have been an act of unification," he said.
The new theory, detailed in a new book by Parker Pearson, Stonehenge: Exploring the Greatest Stone Age Mystery
(Simon & Schuster, 2012), is one of many hypotheses about the mysterious monument. Theories range from completely far-fetched (space aliens or the wizard Merlin built it!) to far more evidence-based (the monument may have been an astronomical calendar, a burial site, or both).