The Sarsen stones of Stonehenge are the upright stones that form the main circle of stones. They are made of sandstone and the ones used at Stonehenge were transported from Wales some 4000 to 5000 years ago. Many other megalithic sites in Britain use Sarsen stones, and they are found all over the land. Salisbury Plain lies in the county of Wiltshire, a beautiful part of the country about 85 miles (135 km) south-west of London. If you are heading out that way, be sure to take in Glastonbury Tor, which is only another 50 miles west.