Fodor's Expert Review Cathédrale de la Nouvelle Major

This gargantuan, neo-Byzantine, 19th-century fantasy was built under Napoléon III—but not before he'd ordered the partial destruction of the lovely 11th-century original, once a perfect example of the Provençal Romanesque style. You can view the flashy interior (think marble and rich red porphyry inlay) of the newer of the two churches; the medieval one is being restored.