The ruins of a megalithic monument (see megalith),
dating from the Stone Age and early Bronze
Age, on Salisbury Plain, southern England. Its most noticeable features
are concentric rings of stones surrounding a horseshoe of upright stones,
and a solitary vertical stone, the Heel Stone, some 100 meters to the north-east.
Stonehenge was built between c.1900 BC and c.1400
BC in three distinct phases. It appears to have been
both a religious center and an observatory from which predictions of astronomical
events could be made.