Natural features

Postojna Cave and Predjama Castle

Slovenia Postojna Postojna

Postojna Cave and Predjama Castle
Photo: Lettkemann, CC BY-SA 4.0, via Wikimedia Commons

One of the largest show caves in the world, where an electric train runs 3.7 km into spectacular halls of stalactites, followed by a guided walk. The cave is home to the olm, a blind, pale salamander that can live for 100 years.


Nearby, Predjama Castle is built into the mouth of a cave in a 123 m cliff, the home of a medieval robber knight. A combined ticket covers both. It's about 45 minutes from Ljubljana. The Škocjan Caves, a UNESCO site with an enormous underground canyon, are another option.

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