The Megaliths of Carnac - The largest gathering of standing Stones in the world

In Brittany ( my favorite part of France) stands 7000 years old megalithic alignments and one of the most important European prehistory centers in existence. 
The two main sites, Menec and Kermario)  ( out of many more in the wide area) alone account for almost 3000 menhirs ( stones) and run well over 4 miles.

The stones are to this day surrounded by mystery, to what they were actually used for.