Near to  Episkopi located the Castle of Kalamos, said Kastromonastiro. The Venetian fortress was built about 1600 with the main task of the control of navigation in the sea close Kalamos and Mitikas Aitoloakarnanias. Are only saved his departments from tall stone with beautiful arches made ​​battlements outside. The abandonment, the earthquakes and the deterioration of time have struck pitiless Kastromonastiro.

Little is currently known simply this impressive monument. It is said that the castle is buried mother of fighter of 1821 Karaiskaki. In this at times different farmers they found various artifacts between them and young child coffin of brick red marked Corinthus. Also, the mosaic pieces.