Located on the cliffs of Carolles, the ‘Cabane Vauban’ (Vauban hut), built at the end of the 17th century, offers an impressive overlooking of the Mont-Saint-Michel bay. The hut belongs to a set of defences desired by Sébastien Le Prestre, Marquis de Vauban, the military architect of King Louis XIV. This network of small guardhouses made it possible to monitor the movements of enemy ships. Built to last, the walls and roof are made of corneal rubble stones, the same metamorphic rock on which the hut rests. Corneal stones are very resistant and protect the granite cliffs from erosion.