It's thought that the 3,000 megaliths of the Carnac Stones in Brittany, France, mark the extreme positions of the moon during a major lunar standstill. The Callanish Stones on the Isle of Lewis in ...

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.