During the Hundred years War the fortifications of Mont St. Michel were reinforced (1420) and the Romanesque choir collapsed Construction of the present clever began in 1448. In 1622 the abbey became part of the Congregation of St. Maur; three western nave bays and the facade were destroyed and replaced with large terrace. The abbey was dissolved at the Revolution (1789-95), and it was used as a prison in the 19th. century. It was severely burnt in 1856, but thorough restorations were not undertaken until 1874.
The buildings of Mont St. Michel are constructed of granite, but there is some limestone in the cloister.