In the village of Mandraki is located the Knights Castle in which you may find the monastery of Panaghia Spiliani (Holy Virgin of the Caves) dating back from the year circa 1400.

Starting from the classical antiquity period the acropolis of the ancient town of Mandraki, Palaiokastro, is maintained in a perfect condition. The overall length of the fortress is quite large. The wall and the cliff set the border of a surface of circa 130.000 m2 in total with an overall perimeter of circa 2 kilometres whereas the weight of several stones composing the wall can reach the 3,5 tons.

Other Knights Castles are:
 the one of the village of Eboreios, in which you may find the Byzantine church of Taxiarch containing frescos of major significance,

 of Íékeia, remnants of which are found in the highest point of the residential complex from where you can gaze the neighbouring islands and the volcano,

 in Argos in the monastery of Timios Stavros (Holy Cross).

In the village of Paloi you may find the Ancient Roman Baths in which the small church of Panaghia Thermiani (Holy Virgin of the Thermal Springs) is located as well.