Walls, towers and gates Torre Normanna The Norman Tower, part of the homonymous Castle, is the largest tower of the 4 towers that make up the castle. The tower took this name because it was renovated in the first half of the eleventh century by the Normans. It has a quadrangular base structure and a height of 34 meters. Inside it is decorated with beautiful frescoes. The tower is the historical and cultural symbol of the city.