Crowning a lofty promontory, Calvi’s massive fortified citadel offers superb wraparound views from its five bastions. Built by the town’s Genoese governors, it has fended off everyone from Franco-Turkish raiders to Anglo-Corsican armies. Inside the battlements, don’t miss the well-proportioned Caserne Sampiero, a military barracks that once served as the Genoese administration's seat of power, and the 13th-century Cathédrale St-Jean Baptiste, whose most celebrated relic is the ebony Christ des Miracles, credited with saving Calvi from Saracen invasion in 1553.