Cathédrale St-Étienne

Culminating in a fabulously carved altarpiece, the cathedral's wide, vaulted choir (1275–1592) is flanked by soaring twin side-aisles in classic Gothic style. That's thrust incongruously together with a heavy nave barely half the width and considerably older (except for the west portal and rose window, which came later). The result is a fascinating sense of architectural schizophrenia.