Everyone has heard of Stonehenge, but few know the Carnac Stones. These are 3,000 megalithic stones arranged in perfect lines over a distance of 12 kilometers on the coast of Brittany in the North-West of France. Mythology surrounding the stones says that each stone is a soldier in a Roman legion that Merlin the Wizard turned in to stone. Scientific attempts at an explanation suggests that the stones are most likely an elaborate earthquake detector. The identity of the Neolithic people who built them is unknown.