Roma,Castel Sant&#x27;Angelo-It was Used as shelter for popes and as jail. To make it safer in 1277 it was joined to the Vatican by the famous &quot;Passetto&quot;. This long fortified passageway allowed the pope to walk safely from the Vatican to Castel Sant&#x27;Angelo. Today it is a Museum (National Museum in Castel Sant&#x27;Angelo). There are collections of weapons and documents about the history of the castle. Lazio