A fantastic tour!
The ruins of KatoChora are the most interesting LOST PLACE I have ever seen. The Venetian fortress is around 600 years old.
The entire large area is accessible, as are the buildings. Despite the advanced state of decay, you don't have to worry that they could collapse on you. Everything seems lifelike. Some houses were inhabited until the 1950s.
The location on a steep cliff and the fantastic view of the mountains and especially the sea make everything even more attractive.