Kastro a medieval village located in the center of the island with an elevation of 650 meters. It’s name derived from the ruins of a castle that once stood there. Perhaps the oldest village on Thassos. Kastro was totally abandoned apart from the church of St. Athanasios. Today nearly all of its houses have been restored and the village relives its former glory every year on the fest day of Agios Athanasios.