STONEHENGE -Wiltshire, England

Stonehenge - Britain's most famous prehistoric monument, on Salisbury Plain in southern England. It consists of two circles of large standing stones, one inside the other. (...) Some of them have fallen, but some are still in position. Stonehenge was built between 3000 and 1500 BC. Nobody knows why it was built, but many people think it was to study the stars and planets or to worship the sun, because a line through its centre would point directly to the position of the rising sun on Midsummer's Day or of the setting sun in midwinter. (...) Stonehenge was made a World Heritage Site in 1986.

(the above  text was taken from Oxford Guide to British and American Culture, Oxford University Press 2005)