The Benedictine Abbey of Mont-Saint-Michel is one of the most remarkable examples of mediaeval religious and military architecture and was one of Christianity's most important pilgrimage sites from the 8th to the 18th century.The Abbey comprises a superb ensemble of clerical buildings including the abbey church, the cloister, the refectory, the monks' ambulatory and the gardens of what has been known as the ""Merveille"" (Marvel) since the 12th century. In summer, the Abbaye du Mont-Saint-Michel is best seen in all its splendour after sunset during the special “sons et lumières"" shows. Designated world heritage site by UNESCO. Open: > 2nd May to 31st August: from 9 a.m. to 7 p.m. > 1st September to 30th April: from 9.30 a.m. to 6 p.m. Last admission 1 hr before closing time. Closed: > 1st January, 1st May and 25 December. Admission fees: Adults : 9€; Concessions (18 to 25) = 5,50 €; Free admission: minors under 18*; Free admission: 18-25 years old* (citizens of one of the 27 countries of the EU or are non-European permanent residents of France) * excluding school groups