North of the Mont-Saint-Michel bay, the Carolles’ Cabane Vauban (Vauban hut) is a small building entirely made of stone. It belongs to a set of defences desired by Vauban in the 17th century so as to monitor the movements of enemy ships. Two other similar buildings are spread out around the bay, at Champeaux and Saint-Jean-le-Thomas. From the top of Carolles’ cliffs, the views over the bay are all superb. The customs officers’ path blends with the steep coastline, crossing a wide variety of landscapes of broom heaths, heather, ferns, blackthorns and elder trees... so many colours and scents, without ever taking your eyes off the sea.