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Slovenia🇸🇮 | landmarksPostojna Cavesunderground railway, stalactite halls, vast caverns | things to do and best time to go

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Backpacking in Postojna Caves
By Johan Kruseman 🇳🇱 | Updated October 4, 2026

Most people don’t realize the famous train ride inside Postojna Cave is less “mystical journey into the underworld” and more “theme park queue on rails” - but that’s exactly why it’s weirdly perfect for tired backpackers who want maximum payoff for minimal effort. Postojna sits in southwestern Slovenia, near the town of Postojna, about an hour from Ljubljana and on the main route toward the coast, so it slots easily into an Interrail-style loop. The cave itself is outrageous: cathedral-sized chambers, dripping formations, and those alien little olm “baby dragons” that actually live there. It’s also expensive by Balkan standards, heavily commercialized, and absolutely rammed in peak season; you’ll shuffle in big tour groups and the vibe can feel more school trip than expedition. But the infrastructure is flawless, it’s doable even with a hangover and a daypack, and if you time a quieter slot, the scale of the underground world still hits hard.

Discover everything you want to know in the 📖 Slovenia Travel Guide.


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✨ Why go?
Ranked #99 unique site in SloveniaReasons people choose to visit here

The Postojna Caves in Slovenia are a must-see for backpackers, but let’s cut through the Instagram fluff. Yes, it can get crowded, especially in peak season. But here’s the kicker: the sheer scale and beauty of these caves are jaw-dropping. You’re walking through a 17-mile network of tunnels, with formations that look like they belong in a fantasy novel.

The cost is reasonable, especially considering the experience. A ticket gets you a guided tour and a train ride through the caves, which is a fun twist. You’re not just staring at rocks; you’re immersed in a living ecosystem, home to the elusive olm—a blind salamander that’s a real-life creature feature.

What makes this spot even better is its accessibility. It’s a quick detour from major routes, making it easy to fit into your itinerary. … read more 👉
The Postojna Caves in Slovenia are a must-see for backpackers, but let’s cut through the Instagram fluff. Yes, it can get crowded, especially in peak season. But here’s the kicker: the sheer scale and beauty of these caves are jaw-dropping. You’re walking through a 17-mile network of tunnels, with formations that look like they belong in a fantasy novel.

The cost is reasonable, especially considering the experience. A ticket gets you a guided tour and a train ride through the caves, which is a fun twist. You’re not just staring at rocks; you’re immersed in a living ecosystem, home to the elusive olm—a blind salamander that’s a real-life creature feature.

What makes this spot even better is its accessibility. It’s a quick detour from major routes, making it easy to fit into your itinerary. Pair it with a visit to Lake Bled or the Triglav National Park for a well-rounded adventure.

In short, the Postojna Caves are not just a stop; they’re a highlight that adds depth to your journey through Slovenia. Embrace the crowds, soak in the magic, and keep moving.

💡 HighlightsDon't-miss highlights and experiences

  • Cave train ride: The iconic electric train that zips you deep into the cave — a no-sweat, almost surreal way to cover long distances underground. It’s historic, oddly joyful, and my personal favorite because it gets you into the heart of the system without burning your legs.
  • Concert Hall (Great Hall): A cathedral-scale chamber with amazing natural acoustics and dramatic rock formations; standing in that space gives a real sense of the cave’s size and why people use it for performances and ceremonies.
  • ”Brilliant” stalagmite: A famous glittering calcite column that catches the lights like a natural chandelier — the kind of formation photographers and geology nerds both point at and grin.
  • Underground river and karst passages: Active water still carves the cave, so you’ll see tunnels, stone
… read more 👉
  • Cave train ride: The iconic electric train that zips you deep into the cave — a no-sweat, almost surreal way to cover long distances underground. It’s historic, oddly joyful, and my personal favorite because it gets you into the heart of the system without burning your legs.
  • Concert Hall (Great Hall): A cathedral-scale chamber with amazing natural acoustics and dramatic rock formations; standing in that space gives a real sense of the cave’s size and why people use it for performances and ceremonies.
  • ”Brilliant” stalagmite: A famous glittering calcite column that catches the lights like a natural chandelier — the kind of formation photographers and geology nerds both point at and grin.
  • Underground river and karst passages: Active water still carves the cave, so you’ll see tunnels, stone bridges and small falls. It’s a live demonstration of karst geology — not just pretty rock, but ongoing natural processes.
  • Proteus vivarium: A small display where you can see the olm (the pale, blind “human fish”), an endemic and oddly charming cave salamander — rare, scientifically important, and culturally tied to the Dinaric karst story.
  • Speleothem gallery and sculpted chambers: Dense clusters of stalactites, stalagmites, flowstones and draperies lit to show off colors and textures — the classic “cave look” composed on a grand scale.
  • Historic and scientific exhibits: Short museum-style displays about the cave’s exploration, the old show-cave traditions, and speleological research — useful context that turns formations into stories rather than just photo ops.
Spotted a mistake or missing something? Contact us.

Things to do around Postojna Caves

Postojna Cave and Predjama Castle - Entrance Tickets Included

Postojna Cave and Predjama Castle - Entrance Tickets Included

4.8(1175) 6h
From €114
per personViator
Slovenia in One Day: Small-Group Bled, Postojna Cave & Predjama

Slovenia in One Day: Small-Group Bled, Postojna Cave & Predjama

4.9(946) 10h
From €115
per personViator
Ljubljana: Postojna cave & Predjama castle small group tour

Ljubljana: Postojna cave & Predjama castle small group tour

4.8(174) 5h 30m
From €68
per personViator
Slovenian highlights - Lake Bled, Postojna Cave & Predjama Castle from Ljubljana

Slovenian highlights - Lake Bled, Postojna Cave & Predjama Castle from Ljubljana

4.9(141) 10h 30m
From €119
per personViator
Postojna cave, Predjama castle and Piran tour from Ljubljana

Postojna cave, Predjama castle and Piran tour from Ljubljana

5.0(116) 10h
From €112
per personViator
Slovenia's Prime Gems: Lake Bled & Postojna Cave - from Ljubljana

Slovenia's Prime Gems: Lake Bled & Postojna Cave - from Ljubljana

4.7(128) 10h 30m
From €160
per personViator
Postojna cave & Predjama castle half day – all tickets included

Postojna cave & Predjama castle half day – all tickets included

4.6(119) 5h 30m
From €106
per personViator
Highlights of Slovenia - Postojna & Bled (Tickets included)

Highlights of Slovenia - Postojna & Bled (Tickets included)

4.9(87) 11h
From €169
per personViator
Postojna cave and Predjama castle Tour from Ljubljana

Postojna cave and Predjama castle Tour from Ljubljana

5.0(66) 5h 30m
From €70
per personViator
Postojna Cave, Predjama Castle and Piran with tickets included

Postojna Cave, Predjama Castle and Piran with tickets included

4.8(71) 10h 30m
From €139
per personViator

Ratings based on Tripadvisor reviews. When you book through this link, you support our work at no extra cost to you.

🌤️ When to go?Weather, crowds, and seasonal trade-offs

  • Weather: The caves maintain a steady 10°C (50°F) year-round, so outside weather barely matters underground. However, rainy or snowy days outside can make the surrounding area slippery and less pleasant for hiking or exploring nearby attractions.
  • Temperature: Inside the caves, it’s a cool 10°C (50°F) no matter the season. Outside, summers hover around 20-25°C (68-77°F), while winters dip below freezing, which can affect your overall comfort and travel plans.
  • Daylight Hours: Summer offers long days with up to 16 hours of light, perfect if you want to combine the cave tour with other outdoor activities. Winter days shrink to about 8 hours, limiting your daylight for exploring the region.
  • Crowds: Peak season is June to August, when tour groups flood the caves, turning the experience into
… read more 👉
  • Weather: The caves maintain a steady 10°C (50°F) year-round, so outside weather barely matters underground. However, rainy or snowy days outside can make the surrounding area slippery and less pleasant for hiking or exploring nearby attractions.
  • Temperature: Inside the caves, it’s a cool 10°C (50°F) no matter the season. Outside, summers hover around 20-25°C (68-77°F), while winters dip below freezing, which can affect your overall comfort and travel plans.
  • Daylight Hours: Summer offers long days with up to 16 hours of light, perfect if you want to combine the cave tour with other outdoor activities. Winter days shrink to about 8 hours, limiting your daylight for exploring the region.
  • Crowds: Peak season is June to August, when tour groups flood the caves, turning the experience into a slow-moving line rather than a magical journey. Shoulder seasons (April-May, September-October) offer fewer people and a more intimate vibe.
  • Seasonal Activities: Summer brings festivals and outdoor events nearby, but these also mean higher prices and crowds. Winter is quiet, with fewer tourists but limited extra activities outside the caves.
  • Price Fluctuations: Ticket prices rise during peak summer months and holidays. Booking in shoulder seasons can save you a few euros and spare you the hassle of sold-out tours.

Pro-tip: Visit in late spring or early fall—cool weather, manageable crowds, and a chance to soak in the region’s raw charm without the tourist circus.


source: climatestotravel.comJANJanuary: fair for travelingFEBFebruary: fair for travelingMARMarch: good for travelingAPRApril: highly recommended for travelingMAYMay: highly recommended for travelingJUNJune: good for travelingJULJuly: fair for travelingAUGAugust: fair for travelingSEPSeptember: highly recommended for travelingOCTOctober: highly recommended for travelingNOVNovember: good for travelingDECDecember: fair for traveling
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🛏️ Where to stay?Choosing the right base

Staying near Postojna Caves? Let’s cut through the fluff. The area can get crowded, especially in peak season, but there are spots that still hold their charm.

First up, Postojna itself. It’s a small town, but it’s buzzing with backpackers. You’ll find a mix of budget accommodations, from hostels to guesthouses. The vibe here is friendly, making it easy to meet fellow travelers. Plus, you’re just a stone’s throw from the caves, so you can beat the crowds by getting there early.

Then there’s the nearby village of Predjama. It’s quieter and offers a unique experience with its famous castle perched … read more 👉
Staying near Postojna Caves? Let’s cut through the fluff. The area can get crowded, especially in peak season, but there are spots that still hold their charm.

First up, Postojna itself. It’s a small town, but it’s buzzing with backpackers. You’ll find a mix of budget accommodations, from hostels to guesthouses. The vibe here is friendly, making it easy to meet fellow travelers. Plus, you’re just a stone’s throw from the caves, so you can beat the crowds by getting there early.

Then there’s the nearby village of Predjama. It’s quieter and offers a unique experience with its famous castle perched in a cliff. Staying here gives you a chance to soak in the local culture without the tourist rush. The accommodations are cozy, and you’ll often find yourself sharing stories with locals over a hearty meal.

If you’re feeling adventurous, consider camping in the surrounding nature. There are spots that let you pitch a tent, offering a genuine connection to the stunning landscape. Just be prepared for the elements.

In short, whether you choose Postojna or Predjama, you’ll find a welcoming atmosphere. Just remember, the real magic lies beyond the crowds.
Best hostels in Slovenia


Best quality hotels in Slovenia

👛 Costs (as of 4 October 2026)Money, prices, and spending tips

Visiting the Postojna Caves in Slovenia is a unique experience, but it comes with its own set of costs. Here’s a breakdown to help you plan your visit without any surprises.
  • Entrance Fee: Expect to pay around €28 to €30 for a standard adult ticket. This includes a guided tour through the caves, which is essential to fully appreciate the stunning formations and history. Discounts are available for children and families, so check for those if you’re traveling with kids.
  • Transportation: If you’re not driving, budget around €10 to €15 for a round-trip bus ticket from Ljubljana. Trains are also an option, but they might take longer and cost a bit more. If you’re driving, factor in fuel costs and parking fees, which can be around €5.
  • Food and Drink: Inside the visitor center, meals can be pricey. A
… read more 👉
Visiting the Postojna Caves in Slovenia is a unique experience, but it comes with its own set of costs. Here’s a breakdown to help you plan your visit without any surprises.
  • Entrance Fee: Expect to pay around €28 to €30 for a standard adult ticket. This includes a guided tour through the caves, which is essential to fully appreciate the stunning formations and history. Discounts are available for children and families, so check for those if you’re traveling with kids.
  • Transportation: If you’re not driving, budget around €10 to €15 for a round-trip bus ticket from Ljubljana. Trains are also an option, but they might take longer and cost a bit more. If you’re driving, factor in fuel costs and parking fees, which can be around €5.
  • Food and Drink: Inside the visitor center, meals can be pricey. A quick bite might set you back €10 to €15. If you want to save, consider packing snacks or a picnic to enjoy outside the caves. There are lovely spots nearby that offer a great atmosphere without the tourist mark-up.
  • Souvenirs: If you’re looking to take a piece of the experience home, budget around €5 to €20 for small souvenirs. The cave-themed items can be fun, but don’t feel pressured to buy. The real treasure is the experience itself.
  • Guided Tours: While the standard entrance fee includes a guided tour, specialized tours can cost more, around €50 to €70. These often delve deeper into the geology and history, so consider if that’s worth it for you.

Overall, a day at Postojna Caves can range from €50 to €100 per person, depending on your choices. It’s a worthwhile investment for the experience, but be prepared for the crowds and the costs.


source: postojnska-jama.eu
⚠️ Prices can change and everyone travels differently, so take this as a rough guide. Hope it helps you plan your adventure!

FAQCommon questions from travelers

Postojna Caves is a 24,120-meter-long karst cave system in Slovenia, famous for its stunning stalactites and stalagmites and the unique cave train ride. It is one of the largest cave systems in Europe and a major tourist attraction since 1819.
You need about 1.5 to 2 hours to visit Postojna Caves, including the 3.7-kilometer train ride inside the cave and the guided walking tour. Booking tickets in advance is recommended, especially in peak season from May to September.
Postojna Caves is located near the town of Postojna, about 50 kilometers southwest of Ljubljana. You can reach it by train or bus from Ljubljana, or by car via the A1 motorway, with clear signs directing to the cave entrance.
⚠️ Things can change over time, so always validate details locally before you go.

Other Slovenian landmarks near Postojna Caves

Explore more nearby:

  • Škocjan Caves—subterranean river, colossal chambers, UNESCO site| 21 km away
  • Vintgar Gorge—wooden walkways, rushing river, narrow canyon| 69 km away
  • Kozjak Waterfall—mossy gorge, emerald pool, secluded cascade| 71 km away

💡 Not sure where to go next?
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We 💚 feedbackKey takeaways before you go

The Postojna Caves are a wild ride beneath Slovenia, a labyrinth of stunning formations that feel like stepping into another world. The guided tours are a bit touristy and can get crowded, but the sheer scale and beauty of the caves make it worth it. Just be ready for the ticket price—it’s not cheap. Still, if you’re after a unique experience that’s genuinely awe-inspiring, these caves deliver.

✈️ When did I visit Slovenia?
In August 2020 I backpacked through Slovenia, with a quick visit to Venice in Italy.

✍️ Help improve this page!
The information on this page is based on my own backpacking experience in Slovenia, supplemented with up-to-date research and feedback from other travelers. Travel details can change, so if you notice anything outdated or incomplete, feel free to let me know.



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Johan, backpacker and founder of TakeYourBackpackHi, I’m Johan (Netherlands 🇳🇱), the creator of TakeYourBackpack. Over the past 3 decades, I’ve backpacked through 90+ countries across six continents, gaining extensive experience with independent travel, long-term trips, and overland routes.

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