Cathédrale St-Étienne Yonne

This vast Gothic cathedral and its stately 68m-high bell tower dominate Auxerre's skyline. The choir, ambulatory and some of the vivid stained-glass windows date from the 1200s. The 11th-century Romanesque crypt is ornamented with remarkable frescoes, including a scene of Christ à Cheval (Christ on Horseback; late 11th century) unlike any other known in Western art. In July and August an hour-long son et lumière (sound-and-light) show is held Wednesday through Saturday at 10pm inside the cathedral.