Built in 1244, this palace became home to King Enzo of Sardinia, who was imprisoned here in 1249 after he was captured during the fierce battle of Fossalta. He died here 23 years later. The palace has other macabre associations as well: common criminals received last rites in the tiny courtyard chapel before being executed in Piazza Maggiore. The courtyard is worth peeking into, but the palace merely houses government offices.
Piazza Re Enzo, Bologna, 40121, Italy