Predjama Castle is a four storey castle built in the gaping mouth of a cavern halfway up a 123m cliff. It was built piecemeal over the years from 1202, but most of what is there to see is from the 16th century.

The castle is a great destination for children of any age because it has a drawbridge over a raging river, holes in the ceiling of the entrance tower for pouring boiling oil on invaders, an eerie dungeon, a 16th-century chest full of treasure and a creepy hiding place, which is called Erazem's Nook, named after Erazem Lueger. Erazem was a robber-baron, who lived in the 15th century and like Robin Hood, stole from the rich to give to the poor. In the 15th century, the Austrian army surrounded the castle, but could not conquer it. There was a secret passage leading out from behind the rock wall and when surrounded, Erazem sure thing did not starve. He even threw fresh cherries on the soldiers to mock them. But the army ended the mocking by hitting him with a cannonball when he sat on the toilet.