Postojna Cave

A 24.34 km karst cave system carved by the Pivka River near Postojna, southwestern Slovenia. One of the country's top tourist sites, explored partly aboard an underground train through chambers of stalactites and stalagmites.

Length Ranking Location
24.34 km Country's 2nd-longest cave Postojna, Slovenia
Stalactite and stalagmite formations inside Postojna Cave, Slovenia

Highlights not to miss

A passage inside Postojna Cave lined with stalactites

Stalactite and stalagmite halls

Chambers throughout the cave system are lined with formations built up over thousands of years by mineral-rich dripping water.

Illuminated cave formations at Postojna Cave

The underground cave train

Part of the visit runs by electric train through several kilometers of passages, before continuing on foot through the show cave sections.

Deep passage inside the Postojna karst cave system

Predjama Castle nearby

A short drive away, Predjama Castle is built directly into a cave mouth partway up a limestone cliff, an easy pairing with a Postojna visit.

Postojna Cave is visited on a guided route with fixed departure times. Confirm current tour schedules and ticket prices on the official Postojna Cave website before visiting.

Why visit Postojna Cave

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One of Slovenia's top sights

At 24.34 km, Postojna is the country's second-longest cave system and one of its most visited tourist attractions.

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An underground train ride

A rare way to see a cave system, riding an electric train deep into the karst before continuing the tour on foot.

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Easy to pair with Predjama Castle

The nearby castle built into a cliff-face cave makes a natural second stop on the same day.

Getting to Postojna Cave

Postojna Cave, Postojna, Slovenia
  • Near the town of Postojna in southwestern Slovenia, about 50 km from Ljubljana.
  • The cave system was formed by the Pivka River and remains an active karst environment.
  • Guided visits combine a train ride with a walking route through the show cave; wear warm clothing as underground temperatures stay cool year-round.
  • Confirm current tour times, ticket prices, and combined tickets with Predjama Castle on the official Postojna Cave website.

FAQ

How long is Postojna Cave?

The system runs 24.34 km, making it Slovenia's second-longest cave, after the Migovec System.

Can you visit Postojna Cave on your own?

No. Visits follow a guided route that includes a train ride through part of the system, with fixed departure times throughout the day.

Is Postojna Cave cold?

Yes, cave temperatures stay cool year-round regardless of the season outside, so warm clothing is recommended even in summer.

Can I combine Postojna Cave with Predjama Castle?

Yes, the castle built into a cliff-face cave is a short drive away and is commonly visited on the same day, often with a combined ticket.

A karst cave carved by the Pivka River

Postojna Cave is a 24.34 km karst cave system near the town of Postojna in southwestern Slovenia, formed over time by the Pivka River. It is the country's second-longest cave system, after the Migovec System, and one of its leading tourist destinations.

The cave has drawn visitors for centuries, and its show-cave sections are reached partly by an electric underground train before continuing on foot through chambers of stalactites, stalagmites, and other karst formations.

A short drive from Postojna, Predjama Castle is built directly into the mouth of a cave roughly 123 meters up a cliff face, and is often visited alongside the cave on the same trip.

Cave chamber with stalactite formations at Postojna Cave