POSTOJNA CAVE AND PREDJAMA CASTLE

The Postojna Caves, one of Slovenia's most notable natural sights, consisting of a 27-kilometer system of underground caves, tunnels, galleries and halls with spectacular dripstones. A small cave train will take you on a tour around the caves, which are also known for providing habitat for Proteus anguinus, an endemic amphibian salamander.

Predjama Castle, part of which is built into the middle of a 123-meter high vertical cliff face, was originally home of the legendary outcast knight Erasmus. The present castle, which was given its Renaissance appearance in the 16th century, houses a museum.