Stonehenge's altar stone was quarried over 4,600 years ago, far from the Salisbury Plain in Wiltshire. But experts now know ...

Located in Brittany, the Carnac stones are approximately 6,000 years old. This vast collection of about 3,000 stones includes rows, circles, and isolated menhirs, some reaching 21 feet in height.

Avebury was created around 2500 B.C., at around the time Stonehenge was in use. The site appears to have been part of a ...