A legend surrounds this castle. Building began by Hispanic Emperor Hadrian for a mausoleum. Later a plague epidemic decimated Rome's population and Pope Gregory I saw the Archangel Michael sheathing his sword (meaning the end of the epidemic). Attached to the Vatican by a passage in the castle where popes took refuge when things got rough. It's a place full of history that's a real delight for the visitor.
Actually more than being used as just a Castle, the Castle Caetani was more used as a fortress. It has always belonged to the Caetani family, but the Borgias also owned it for a very short while. In fact you only see the Caetani family shields around the Castle. None of the antique furniture remains as it was apparently looted by the French in the eighteenth century. The most impressive thing of this castle is the view of the mountains and the large patio that has inside. The schedule of visits (which are always guided) are: April to September 15-16-17-18 10-11-12 am and pm, from October to March 14-15-16 10-11-12 am and pm . Closed on Thursdays!