On the way from Hora towards Megalo Livadi you will see a cylindrical White Tower which you can approach by following a short path. It is considered to be a building of the Hellenistic period and the church of Agios Charalambos which is located next to it, is built with parts of the Tower. As observatory has of course beautiful views over the island as well as to the ruins of the Castle of Gria (old woman), to the east.