On a low lying hill (85 m) at the center of the drained marshland a small castle survives the perimeter of which is 235 m. Fortified by strong walls which were supported by towers near the gates, it protected the settlement of the Peninsula of Lygia from attacks via land. The area was already inhabited from pre-historic times. However, its habitation in the Late Archaic and Early Classical Age is considered particularly important as it concerns one of the most ancient witnesses of historical times at the Thesprotic village. The archaeological site of Pyrgos opened its gates to the wider public in the summer of 2001, upon the completion of its reformation works and promotion. A tiled path facilitates the guided tour of the visitors around the fortification. In the interior of the restored tower which the Agha of the region built on top of a tower of the ancient fortification so as to survey the extensive plains of the estuary of Kalama- there is an exhibition of posters, old photographs and drawings, in regards to the antiquities on the course of the river of Kalama.