Slovenia is known for being one of the most ... The stunning Predjama Castle, the largest cave castle in the world, is built ...

Why Do a Day Trip to Postojna Cave and Predjama Castle? Postojna Cave – Slovenia’s Most Famous Cave – Ride a unique underground train through vast caverns filled with stunning stalactites ...

Eking through them on an illuminating guided tour is one of Slovenia’s great travel experiences and much more rugged and rewarding than the touristy Postojna Caves, with their tourist train.