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Once a humble little monastery, the island and its fortifications have effectively grown up around this. During the French Revolution, the abbey was used a prison, and an extensive restoration was required to restore it. A few prison-era showpieces, like the human hamster wheel used to lift supplies in and out of the complex, have been kept. Mass is celebrated Tu-Su at 12:15.
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Our Lady underground Chapel
The Carolingian church was built around 966 by the first Benedictine monks at the very place of the oratory erected by Saint-Aubert in the early 8th century. It's at the second level of Mont Saint Michel, and maybe not accessible during your visit.