Approximately how many years ago did the construction of Stonehenge begin?

The iconic prehistoric monument, constructed in phases between 3000 and 2000 BC, remains one of the world's great mysteries. Debate continues - as to both how prehistoric builders managed to move 30 25-ton monoliths and why they did. Theories include the possibility that it was an astronomical observatory, a place for healing, or a funerary monument.

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