The third and final phase of Stonehenge embraces a period of 1000 years and is marked by a change from building in wood to building in stone.

It can be divided into three stages: first a crescent of blue stones from Wales, then the sarsen stone circle and finally, rearrangement of the stones into their present form.

The sarsen stone circle, with its huge squarely shaped stones, its sophisticated joints and its perfect geometry, is unique within prehistoric Europe.