Cagliari is the capital city of the Italian island of Sardinia. It’s known for the hilltop Castello, a medieval walled quarter situated high over the rest of the town. Architectural highlights include the 13th-century Cagliari Cathedral. Housed in a former arsenal, the Museo Archeologico Nazionale di Cagliari displays bronze objects, Roman ceramics and artifacts from the Nuragic age to the Byzantine era.