Walls, towers and gates Torre normanna The Norman Tower of Adelfia was built between 1147 and 1153 together with the castle, by Alfonso Balbiano. The Tower has a height of 19 meters. The main function of the tower was to defend and report in the event of assaults or disasters those seeking rescue. The tower passed into the hands of several feudal lords up to the Marquises Nicolai. Today it is well preserved.