On our trip through Slovenia, we couldn’t miss Postojna Cave, one of the country’s most famous natural wonders. As soon as we arrived, we could tell this wasn’t just a simple stop — the place is set up like a real park, with restaurants, exhibitions, and plenty of space for visitors.
Arrival & Tickets
We found the parking area easily; it’s big and right by the entrance, though it does get busy, so coming earlier is better. We had already booked our tickets online, which turned out to be a great idea. You choose a specific time slot in advance, so there’s no stress about whether you’ll get in. We also decided to book a combo ticket for the Vivarium, which is right next to the cave entrance and showcases the unique life that has adapted to the underground world.
When our time came, we queued up with our group. The organization was impressive: there are separate lines depending on the language of your guide and the tour time you booked. Everything ran smoothly and felt very professional.
Inside the Cave
The moment we stepped through the entrance tunnel, the temperature dropped sharply. It’s a constant 10 °C inside year-round, so we were glad we’d packed jackets. Even on a warm summer day, you’ll definitely want something cozy to wear.
The tour begins with the famous underground train ride. It’s not just a novelty — the cave system is enormous, and the train helps cover the first few kilometers quickly. Racing past stalactites and opening into vast chambers feels like entering another world.
After the train, the walking part begins. Our guide led us through stunning halls, galleries, and narrow passages, explaining how the cave formed over millions of years as the Pivka River carved through the karst rock. We saw towering stalagmites, delicate curtains of calcite, and shimmering underground rivers. The paths are well lit and easy enough to walk, though a bit damp in places, so good shoes help.
The whole tour lasted about an hour and a half, a perfect balance of riding and walking. It never felt rushed, but it also didn’t drag — just enough to keep the magic alive.
The Vivarium
After coming back to daylight, we headed straight to the Vivarium. If the cave is about the majesty of rock formations, the Vivarium is about the hidden life within them. It’s home to the cave’s most famous residents: the olm, also called the “human fish” for its pale skin. These strange, blind amphibians live their entire lives in the darkness, can survive without food for years, and look like creatures from a fantasy story.
The Vivarium also houses beetles, spiders, and other tiny creatures that have adapted to the extreme cave environment. It was fascinating to see how life manages to exist in complete darkness, in such a fragile ecosystem. The exhibits are interactive and educational, so it’s not just for kids — we learned a lot.
Final Thoughts
Postojna Cave and the Vivarium together made for an unforgettable visit. From the smooth online booking and well-organized entry process, to the magical train ride and the mysterious world of the olm, it was an experience that felt both professional and deeply personal.
If you’re planning a trip:
- Book online in advance to secure your time slot.
- Dress warmly and wear good shoes.
- Consider the combo ticket with the Vivarium — it adds another layer of wonder to the day.
For us, it was easily one of the highlights of our time in Slovenia.
Postojna Cave – FAQ
How long does a Postojna Cave tour take?
Our guided tour took about an hour and a half, including the underground train ride and the walking part.
What is the temperature inside Postojna Cave?
Around 10 °C all year round, so bring a jacket even on a hot day. The paths are damp in places, so wear comfortable shoes.
Do you need to book Postojna Cave tickets in advance?
We booked online in advance and recommend it – you choose a specific entry time, so there is no stress about queues. Check current prices and times on the official website.
Is there parking at Postojna Cave?
Yes, a large car park right by the entrance. It fills up quickly in high season, so arrive early.
Is the combined ticket with the Vivarium worth it?
We think so. The Vivarium is right next to the cave entrance and shows the animals living underground, including the famous olm, nicknamed the “human fish”.
Is Postojna Cave suitable for children?
The paths are well lit and easy to walk, and the Vivarium exhibits are interactive and educational – not only children will learn something there.