The collegiate church was built during the first half of the 12th century and has been restored on many occasions through the centuries. It was so badly damaged during the First World War that, in April 1919, the northern part of the nave and the aisle crumbled down to the ground. In 1971, the whole façade collapsed. The church is, however, still standing, and holds a treasure trove of Romanesque art, including the Christ du Saint-Sang Miracle, a 12th-century wooden christ. If you wish to visit, you must put in a request at the tourist office.