It is one of the most famous, and mysterious, stone circles in the world but who built it, and why?
Was it an ancient calendar? A place of worship, or pilgrimage? Or a burial ground? Or, as some people have even suggested, a landing pad for alien spaceships?
What remains of this 5,000-year-old monument – which sits within a sacred landscape on Salisbury Plain in Wiltshire, England – offers us some extraordinary clues.
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