It dominates over the bay of Koutalas. It is a small, circular marble building and one of the most well-preserved towers in Serifos. It is assumed that it was built in the late 4th century BC, or during the Hellenistic period and it was used as a watchtower for the area control. Next to it there is the chapel of Agios Charalambos and opposite there is the church of Agia Triada (Holy Trinity).