Fridrihštajn Castle was built in the 15th century and is located south of Kocevje on a 970m high hill. Today, only the ruins of the castle remain, which have been rebuilt and thus protected from further decay. The castle can be reached by a short climbing route or the usual easier hiking route. It remains to be a popular spot for hikers.

The ruins of the tallest castle building in Slovenia still testify to the forbidden love story between Frederick of Celje and Veronika Deseniška, who found their refuge in the castle for a short time. But Frederick's father, Herman, disapproved of their romance. He put Frederick in jail and had Veronica drowned . All that is left are the memories and the rock, into which, in ancient times, stonemasons have cut seats for the two lovers ...