Seven Quick Facts
When Built: Earthworks and timber about 3100 B.C., first stones 2600 B.C.
Heaviest Stones: 50 tons
Made of: Sarsen sandstone and Bluestone rock.
Design: Upright stones and earthworks in a series of concentric circles and horseshoe shapes.
Function: Unknown, but researchers suspect it was used for ceremonial and religious purposes.
Built by: An unknown people without a written language.
Other: Designed to be used for astronomical observations including summer solstice.
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