Formerly an Imperial Mausoleum, then Papal fortress and prison, today a National Museum that houses in its richly decorated rooms a vast collection of paintings, sculptures, military items and medieval weapons. All this is completed by a terrace that offers a spectacular view of Rome and the famous Passetto di Borgo, a well-known walkway 800 meters long connecting Castel Sant’Angelo to the Vatican Palaces, still bearing the blows of the Lansquenets’ blunderbusses inflicted during the Sack of Rome, when Pope Clement VII was desperate to escape capture.