A small altar in the southern tower was once dedicated to St. Barbara, protector of artillerymen. Today’s church, located near the outer walls, on the left of the entrance to the tower, was built only in 1960.

The small building, characterised by a simple and plain structure, still preserves, on the door, a precious sculptured lunette coming from the ruins of a 13th century church located in the Castle of Domagnano. Inside the building, on the stone altar is the bronze image of St. Barbara with six tower-shaped candelabrums specially produced in 1979 by the sculptor Bino Bini from Florence.