Postojna Cave: What to Expect and Is It Worth Visiting?

Key Takeaways:

• Postojna Cave is one of the largest and easiest-to-visit show caves in Europe, about 45 minutes from Ljubljana
• The guided tour takes about 1.5 hours: a 3.7 km underground train ride plus an easy walk of just over 1 km
• You can see the olm (“baby dragon”), a blind cave amphibian found only in the caves of the Dinaric Karst
• It stays about 10°C inside all year, so bring a jacket and good shoes
• Most people combine it with Predjama Castle, about 10 km away, in one day

Postojna Cave is Slovenia’s most famous cave and one of the most visited sights in the country. You ride an electric train deep into the cave, walk through huge halls full of stalactites and stalagmites, and see the olm, a blind amphibian that lives only in these karst caves. The tour takes about 1.5 hours and works for almost everyone, from small kids to older travelers.

Whether you’re planning a family trip or a short day out from Ljubljana, this guide covers what to expect, how to get there, what to wear, the best time to go and what else to do in Postojna. It also answers the questions people ask most, like whether dogs are allowed and how accessible the cave is for wheelchairs.

What Is Postojna Cave?

Postojna Cave (Postojnska jama in Slovenian, Grotte di Postumia in Italian) is a cave system about 24 kilometers long under the karst plateau near the town of Postojna. Visitors see about 5 kilometers of it on the standard tour.

The cave formed over millions of years as the Pivka River dissolved and carved the limestone. That left behind big halls, long passages and a huge variety of formations. What sets Postojna apart is how easy it is to visit. The cave is mostly horizontal, so there’s no crawling, climbing or squeezing through tight spaces.

The best-known feature is the cave railway. The first underground cave railway in the world opened here in 1872, and today the cave describes its railway as the world’s only double-track cave railway. The train carries you through a long stretch of the cave that would take a lot of time to walk.

The cave is also home to the olm, a blind, pale amphibian that locals call the “baby dragon.” Olms live only in the underground waters of the Dinaric Karst, are classed as endangered, and can live for more than 100 years. On the tour you see them in a tank inside the cave.

What to Expect on the Postojna Cave Tour

Every visit is a guided tour that starts at set times. Here’s how it works:

The train ride: You board an open electric train that runs 3.7 km into the cave. It passes through narrow passages and big chambers, and it’s the part most people remember. Boarding starts about 15 minutes before your tour time.

The walk: After the train, a guide leads you on foot for just over 1 km. The path is concrete and slip-resistant. One section of about 200 meters goes uphill on a fairly steep slope, then down again. Most people manage it without trouble, but take it slowly if walking uphill is hard for you.

The formations: Each hall looks different. Look out for Brilliant, a bright white stalagmite about five meters tall and the symbol of the cave. The Spaghetti Hall is named after its thin, straw-like stalactites. The tour ends in the Concert Hall, the largest chamber on the route, which is big enough to host concerts.

The olms: Near the end of the tour you can see olms up close in a tank. Keep in mind this is a display, not their wild habitat. If you want to learn more about them, the Vivarium in Postojna Cave Park goes into more detail.

Then the train takes you back to the entrance.

Important things to know:

• The temperature inside stays around 10°C (50°F) all year
• The whole tour takes about 1.5 hours
• Guides speak Slovenian, English, German or Italian, and audio guides are available in many other languages
• Photos and videos are allowed without flash or a tripod
• Arrive about 30 minutes before your tour time

What to Wear to Postojna Cave

Dress for about 10°C, even in the middle of summer. The open train ride feels colder than the walk, and water drips from the ceiling in places, so the path can be damp.

• A warm layer: a sweater, fleece or light jacket. Rain jackets can also be rented at the entrance.
• Closed shoes with grip: sneakers or walking shoes. Skip sandals, flip-flops and heels.
• Long pants: more comfortable than shorts at this temperature.
• Extra layer for kids: children get cold faster, so pack a hat or second sweater.

Is Postojna Cave Worth Visiting? Pros and Cons

For most travelers, yes. It’s one of the easiest big caves in Europe to see, and it fits into a half day. But it isn’t for everyone.

The good:

• Easy access: no climbing or crawling, and the train does most of the work.
• Scale: the halls are huge and the formations are varied.
• Short visit: you see a lot in 1.5 hours, which suits families and travelers on a tight schedule.
• Good facilities: parking, restrooms, restaurants and other attractions are all in the cave park.

The not-so-good:

• Crowds: summer weekends and holidays get busy, and groups can be large.
• Cost: tickets add up for families, especially with Predjama Castle. Check current prices before you go.
• Polished feel: lit paths and timed tours feel very different from a wild cave. If that’s what you want, see the Škocjan Caves or Planina Cave below.

What Visitors Say: Postojna Cave Reviews

Reading through Postojna Cave reviews, the same points come up again and again.

• Most praised: the train ride, the size of the halls, and how easy the visit is for kids and older relatives.
• Most common complaints: large groups in peak season, the cost, and a commercial feel around the entrance.
• Common advice: bring a warmer layer than you think you need, and book a morning slot to avoid the busiest tours.

Is Postojna Cave Wheelchair Accessible?

Partly. The paths and ramps are built for strollers (up to 80 cm wide), and the cave says its tours are suitable for visitors with mobility impairments, with conditions. Because of the uphill section on the walk, wheelchair users and people with limited mobility are generally advised to do the train part only. Contact the cave before your visit so staff can tell you what’s possible on the day.

Strollers work well: a folded stroller can go on the train, and you can use it on the walk, in the Vivarium and in the EXPO exhibition. Predjama Castle is different. It can’t be visited with a stroller or a wheelchair.

How to Get to Postojna Cave

Postojna sits right by the main motorway between Ljubljana and the coast, so it’s easy to reach from most of Slovenia.

From Ljubljana: about 45 minutes by car to the southwest. The road is well signposted, and there’s a large car park at the cave. You can also take a bus or join one of the many day tours from Ljubljana.

From Lake Bled: plan on about 1 hour 15 minutes to 1.5 hours by car. Some organized tours combine Bled and Postojna in one long day.

From the coast: from Koper or Piran it’s under an hour by motorway. If you arrive by cruise ship in Koper, look at Koper shore excursions that include the cave, since they’re timed to get you back to the port.

Public transport: buses connect Ljubljana and the coast with Postojna. From the bus station in town it’s a walk of roughly 20 minutes to the cave entrance. Check current timetables before you go, especially on weekends.

Tip: combined tickets for Postojna Cave and Predjama Castle are available. The castle is about 10 km away, and in summer a shuttle bus usually runs between the two. Check before you go.

Postojna Cave Tours

If you don’t want to drive, a guided tour handles transport and tickets. Pick by where you’re staying and how you like to travel.

Small Group Tours from Ljubljana

The easiest option if you’re based in the capital. One tour adds Predjama Castle, the other focuses on the cave.

Private Tour

Best for families, couples or anyone who wants to set their own pace. For more options, see all private tours in Slovenia.

Tour from Koper (Coast and Cruise Passengers)

A good fit if you’re staying on the coast or arriving by cruise ship in Koper.

Want to see more of Slovenia underground? Browse all cave tours in Slovenia.

Tips for Visiting Postojna Cave

Book ahead: in peak season (June to August) and on weekends, popular tour times can sell out. Booking online also gives you combo tickets with Predjama Castle.

Arrive early: get there about 30 minutes before your tour. Train boarding starts 15 minutes before the tour time, and you need time to park and use the restrooms.

Dress warm: 10°C feels cold after a hot summer day outside. Bring a layer even in July.

Photos: photos and videos are allowed, but no flash and no tripod. You also can’t record the guide’s commentary. The lighting shows the formations well, so a steady hand is enough for decent shots.

Make it a full day: pair the cave with Predjama Castle, and plan lunch in the cave park or in Postojna town.

Traveling with a dog: dogs can’t go into the cave, but free kennels are available for ticket holders near the EXPO Cave Karst building. Spaces are limited.

👉 Get Directions to Postojna Cave, Slovenia

Things to Do in Postojna and Nearby

The cave is the main reason to come, but there’s enough around it to fill a full day or a weekend.

Predjama Castle is the obvious next stop. It’s built into the mouth of a cave in a tall cliff, about 10 km from Postojna. Inside you learn about medieval life and the knight Erazem, who, according to legend, held out here during a long siege.

The Vivarium in Postojna Cave Park is the place to learn more about the olm and other cave animals.

EXPO Cave Karst, also in the park, is an exhibition about how karst caves form and what lives in them. It’s a good rainy-day add-on.

Planina Cave is a wilder option near Postojna. It’s far less developed, and visits feel more like real caving.

Škocjan Caves, about 30 minutes by car toward the coast, are a UNESCO World Heritage site with a huge underground canyon. They suit travelers who want something more dramatic and less polished.

Postojna town is small and easy to walk. You’ll find local restaurants with Slovenian food and a few cafés, which makes it a good lunch stop between sights.

Building a longer route? The guide to the best places to visit in Slovenia shows what else fits into your trip.

When Is the Best Time to Visit Postojna Cave?

The cave is open all year, including Sundays and public holidays, and the temperature inside doesn’t change. So the best time depends on crowds and on what else you want to do that day.

Summer (June to August) is the busiest time. You get the best weather for adding Predjama Castle and other stops, and the most tour times, but also the largest groups.

Spring and fall are the best balance for many visitors. There are fewer people, and the weather is still good for driving and walking outside.

Winter is the quietest season. There are fewer tour times and bus connections, and snow can affect driving, so plan ahead.

In any season, weekdays are calmer than weekends, and the first tours of the morning are usually less crowded than the afternoon ones.

Postojna Cave FAQ

How long does the Postojna Cave tour take?

About 1.5 hours. That includes:

• a 3.7 km train ride into the cave
• a guided walk of just over 1 km
• the train ride back to the entrance

With Predjama Castle and travel, plan for a half day or more.

How deep is Postojna Cave?

In its deepest parts, visitors are up to about 115 meters underground. The whole cave system is about 24 km long, and the tour covers around 5 km of it.

Are dogs allowed in Postojna Cave?

No. Pets aren’t allowed in the cave or the other attractions in the park. You can leave your dog in a free kennel near the EXPO Cave Karst building while you tour (for ticket holders, limited spaces). Dogs are welcome in the outdoor parts of the park.

Can wheelchair users visit Postojna Cave?

Partly. The paths suit strollers, but the walk has a steep uphill section. Wheelchair users are generally advised to do the train part of the tour only. Contact the cave before you go to arrange your visit.

Can kids go on the tour?

Yes. Postojna Cave is one of the most family-friendly caves in Europe. Just:

• bring warm clothes for children
• make sure younger kids are fine with dim light
• bring a stroller if you like: the paths suit strollers, and a folded one can go on the train

What should I wear to Postojna Cave?

• closed walking shoes with good grip
• a sweater or light jacket (it’s about 10°C/50°F inside)
• long pants
• no high heels, sandals or flip-flops

Do you need to book tickets in advance?

It’s a good idea, especially for:

• summer visits (June to August)
• weekends and holidays
• combo tickets with Predjama Castle

Can I take photos inside the cave?

Yes, photos and videos are allowed, but:

• no flash
• no tripods
• no recording of the guide’s commentary

Are there restaurants or cafés nearby?

Yes:

• restaurants and cafés in the cave park, by the entrance
• more choice in Postojna town
• food options at Predjama Castle

Is Postojna Cave better than Škocjan Caves?

They’re different:

• Postojna Cave: easier, more family-friendly, with the train ride and the olms
• Škocjan Caves: wilder, with a huge underground canyon, and a UNESCO World Heritage site
• if you have time, see both

Final Thoughts

Postojna Cave is an easy, well-run way to see one of Europe’s biggest show caves, and it fits into half a day. Go early, dress warm, and add Predjama Castle if you have the time. To skip the driving, pick one of the tours above or browse more small group tours in Slovenia.