Predjama castle
For over 800 years, the mighty castle has stood in the middle of a 123-meter-high stone wall. It is also associated with the legend of the robber knight Erasmus of Predjama, whose treasure (the treasure of Predjama) can be admired in the Notranjska Regional Museum. The cave located underneath the castle is the reason for which the castle is listed in the Guinness Book of World Records as the world’s largest cave castle.