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The tower was part of the fortification and today is used as a bell tower of the cathedral. It is a squat and massive structure, a square plan, and was built with large blocks of travertine from the walls of the nearby Aquino.

Within the city there is a stretch of 300 meters of Lombard walls, remnants of the castle walls. The only ancient gate remaining after the war is that of Santo Stefano, which has a covered walkway with a round arch.