The octagonal tower, was built by Emperor Frederick II on the probable remains of the Greek Theatre. Its octagonal shape, which follows the Eastern model of the Holy Temple in Jerusalem, suggests that it was used for la rosa dei venti. In each case was a defense tower to control that side of the city of Enna, which was exposed to possible assaults of the enemy. The tower rises atop a wooded hill. From its Summit gaze sweeps across the high city and the valleys below, up to Etna.