Mont Saint-Michel stands in the Bay where the River Couesnon runs into the Atlantic Ocean. Perched on a rock, once an impregnable fortress and important centre for pilgrims, it is an extraordinary testimony to medieval architecture. At the foot of the mount, the wall walk runs around the old town, ascending to the abbey rising up towards the sky. Here, visitors are astounded by the cloister seemingly suspended above the sea, the church, monks’ quarters and the buildings known as the “Merveille” or Marvel. The view opens onto the bay which can still be crossed on foot with a guide: it makes an incomparable walk.