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This former fortified castle was built in the 10th century to protect the city from Breton attacks. Located on a rock, it offers beautiful views over the bay of Mont-Saint-Michel and the Sée valley.

The Château d'Avranches was built around 950 by Onfroi Le Dane, on the remains of the old Roman walls. Located on a rock, the fortress could monitor the bay of Mont-Saint-Michel and the various invaders made no mistake and occupied it; Celts with the Abrincates, Romans, Saxons, then Franks. A succession of enclosures and ditches were added to it. The Roman keep unfortunately disappeared in the last century. The top of the curtain forms a platform at the same level as the terrace. A diagram, made by Canon Pigeon, shows how keep and curtain wall were connected. This is also verifiable in a document kept in the Calvados Archives. Another detail should be noted, it is impossible to access the terrace from inside the building. Passages were obstructed after a collapse of the upper level of the building, at an undetermined time. Today, at the top of a crenellated curtain wall, one discovers a panorama over the bay and the valley of the Sée, in the heart of the various Avranchinese districts.