Postojna Cave is the most visited sight in Slovenia and one of the largest show caves in Europe, part of a cave system that runs for more than twenty kilometres under the karst plateau southwest of Ljubljana. Visitors have come here for two centuries, and the experience still begins the old-fashioned way: you board a small open electric train that rattles deep into the hill through galleries of white and rust-coloured formations, then continue on foot through halls of stalactites, stalagmites and curtains, including the famous white Brilliant stalagmite. The cave stays cool year-round at around ten degrees, so bring a jacket even in summer. Visits are guided, at fixed times, with audio guides in many languages. The highlight for many is the olm, the blind, pale amphibian that lives only in these underground waters. The Tiqets venue page sells a small-group half-day tour from Ljubljana that combines the cave with nearby Predjama Castle.
How to visit: the cave is about an hour from Ljubljana by car, bus or train. Book a fixed tour time; packages that add Predjama Castle and the Vivarium, where you can see olms up close, cost less than buying separately. The Tiqets tour handles transport and guiding from central Ljubljana; cave and castle entry tickets are paid on the spot.
What to expect: the visit takes about an hour and a half, with the train ride in and out and a walk of a kilometre or two between. Paths are paved and lit but include some slopes. It is cool and damp underground, and photography rules are set by the park, so ask on arrival.
Making the most of it: winter has fewer tour times but far smaller crowds. Pair the cave with Predjama Castle, about ten kilometres away, for the classic half day.
What to expect
The experience
A guided cave visit with an electric train ride in and out and a walk through the main halls.
Best time
The first tour of the day, or any winter tour, for the smallest groups.
How long
About an hour and a half underground; half a day with travel from Ljubljana.
Tips
Bring a warm layer and good shoes, and buy the combined ticket if you will also see Predjama Castle.
Quick picks
- Best for
- Anyone who wants Slovenia’s most dramatic natural wonder in half a day.
- Families
- The cave train and the olms make it a family favourite.
- Couples
- Combine with Predjama Castle for a memorable half day.
- Pair with
- Predjama Castle and, on another day, Lake Bled.
- Time needed
- Half a day including travel.
Good questions
How far is Postojna Cave from Ljubljana?+
About an hour by car, bus or train, which makes it an easy half-day trip.
How cold is Postojna Cave?+
Around ten degrees all year, so bring a jacket even in summer.
Do I need to book a tour time?+
Yes, visits run at fixed times with a guide or audio guide; booking ahead secures your slot.
Does the Tiqets tour include entry tickets?+
No. It covers transport and guiding from Ljubljana; cave and castle entry tickets are paid on the spot.
What is the olm?+
A blind, pale cave salamander found only in the karst underground; you can see it in the cave and in the Vivarium.
