The Fortress of Ithomi, otherwise known as the Pirgos or Tower, is 700 to 800 metres southeast of the village by the same name (Pirgos Ithomis) at an altitude of 364 metres. It was built of massive stone blocks layer by layer. The ruins of the ancient acropolis of the city of Ithomi surround the Tower. It was built by the Pelasgians, peoples who preceded the Greeks. There are still traces of fortifications around the perimeter of the tower, as well as some other structures from that period.