Some of the castles are like old people.When they get older and finish their work , they get retired. This is one of the castles. It was constructed on the coast of Western Black Sea (Zonguldak -Ereğli). It is also on the peak of a hill in order to control the sea and the land around it.
It was constructed in 4th century BC by Klearchos who founded first acropolis of Heraklie Pontike. Also a cistern was built in order to supply water for the castle. Today only ruins remained from this castle.
This castle is in border of military zone so it isn’t open for visit. That’s why I considered it as a retired castle. It may be opened for a visit in future.