MÉGALITHES

The remains of several dolmens are visible around the Petit Mont mound. Neolithic tombs, 3,500 to 4,000 years old, testify to the function of the island at that time. At the crossroads of Robert's Cross, elements of the gallery of the most important dolmen, which must have been 5 m long, remain. But the "Long Stone" fell prey to quarrymen in the 19th century. To the north, in the dunes of the Mouisonnière beach, stood a menhir visible from the sea: the " Pierre aux rats ". There is now only a masonry obelisk in its place.