All the stones lie tragically prone in this 40m diameter circle-henge, nearly hidden on its approach until you get close, then appearing in all its majesty. The 42 stones themselves are of limestone, weathered into fantastic shapes by the passing millennia.
Normally Neolithic builders used more hard-wearing stone, but limestone does wear into the most amazing gnarled shapes with the passing of the ages. The Rollright Stones near Oxford are made of a similar kind of stone, also weathered into marvellous shapes.
The English Heritage board by the site has an artist's impression of what it originally looked like.