The Byzantine Castle of Paleochora can be found in Paleochora, the island's former capital town.
The fortress dates back to the 12th century, when it was constructed on a hill by Monemvasians and it was named Agios Dimitrios.
These days only ruined parts of it remain since it was destroyed in 1537 by the Barbarossa and the Turkish pirates.
Entering this area, you will find remnants of houses, as well as a few Byzantine churches.
It is believed that around 70 houses and 20 churches used to be located within the walls of the castle.
The castle is surrounded by greenery and you can only get there on foot via a dirt road that starts outside Potamos. From there, it will take you about 1 hour to reach it.