Flock of Birds at Stonehenge, Salisbury, United Kingdom.

Stonehenge is a prehistoric monument in Wiltshire, England, which consists of a ring of standing stones, with each standing stone around 13 feet (4.0 m) high, 7 feet (2.1 m) wide and weighing around 25 tons. The stones are set within earthworks in the middle of the most dense complex of Neolithic and Bronze Age monuments in England, including several hundred burial mounds.
Archaeologists believe it was constructed from 3000 BC to 2000 BC