La Roche-aux-Fées

La Roche-aux-Fées is a Neolithic gallery grave, or dolmen located in the commune of Essé, in the French department of Ille-et-Vilaine in Brittany. Its name comes from a legend that claims that the stones were placed by fairies. The dolmen consists of more than forty stones forming a corridor four times longer than wide. Its northwest-southeast axis is on an alignment with sunrise at the winter solstice.

Source: Wikipedia