Spectacular caves in Slovenia - Which one to choose? | Nest Campers

Spectacular caves in Slovenia - Which one to choose?

inside of Postojna Cave
27. February 2021

While traveling through Slovenia, there are plenty of incredible sights that unfold effortlessly before you as you are making your unforgettable campervan memories. But there are some that need a little bit more effort to be discovered and some are actually hidden under the earth's surface.

In the South-West region of Slovenia the landscape is something special - more diverse, unleveled and with a few or none water surfaces to be seen. Grounds are formed by soluble rocks, mainly limestone, dolomite and gypsum. These rocks do not retain water and are dissolved as slightly acidic rainwater makes its way through the cracks and wholes, leaving behind some incredible nature's formations. This type of landscape is called karst and in Slovenia, it's called Kras. 

Slovenian karst, slovenia kras, explore slovenia
Kras spreads wide from the border of Italy through the Vipavska valley and Brkini region.
photo credit: Domen Šuc

Because the landscape is more or less flat and winds are particularly strong (burja), here we find a very unique build of stone houses and the best of Slovenian prosciutto or “pršut” as we call it. But the main reason why you want to make a stop or two here, are the caves.

This mystical, underground world has been an inspiration for many artists and a feature of Slovenia's national pride. Spectacular caves have been forming for thousands of years and today we are privileged to see their beauty unfold. There are more than 10.000 registered caves in Slovenia, with about 100 newly discovered each year. We can visit quite a few of them, but the grandest and most spectacular of them are Postojnska Cave and The Caves of Škocjan


Postojna Cave

Postojna cave, also known as the Queen of the underground world, is the biggest of them all. It is not just one cave but rather a system of 12 different caves, forming one of the most visited attractions in the whole of Europe.

It was discovered by a simple cave lamplighter in 1818, whilst preparing the original cave for a visit of the Austrian Emperor Franz I. As he himself said it at the time of discovery: “There is a new world here, here in paradise!”. And he was right. Today this area is much more than just a cave. It has grown into a Postojna Cave Park uncovering 24km of discovered underground passages, galleries, and halls. With more than 38 million visitors in the past 200 years and a cave train ride, it is truly a must-see.

Cave train Postojna, Postojna cave
3.2km of Postojna Cave is covered by a cool electric train. 


Water dissolving limestone created magnificent forms of stalagmites and stalactites, from which one stood out and became a symbol of Postojnska Cave. It is a magnificent five-meter-tall, crisp white stalagmite called The Brilliant with an ornament-rich column standing next to it.

There is another treasure, which can only be found here and nowhere else – The Baby Dragons. Pale, blind and fragile olms, with unusually formed bodies, were discovered here in the 17th century and have been a natures enigma since then. They can go without food for up to twelve years and have a lifespan of up to 100 years. 

baby dragon postojna cave
The olms' unusual appearance has been captivating people's imagination for centuries.


And that is not all! Just a few kilometers from Postojna Cave you'll find a majestic cave castle, called Predjama Castle. This world-famous attraction is a true delight for all who love the legends of knights and is a true symbiosis between nature and man's best work.

Predjama castle slovenia
Predjama Castle is definitely worth a visit!



Postojnska Cave Park is open all year round, including on public holidays.
The guided tours run from 10 AM – 4 PM daily and with additional tour times from May to September, going from 9 AM – 6 PM.

Due to the cave's constant temperature of 10°C, it is recommended to wear suitable clothes and shoes when visiting the Postojna Cave – something warm and comfortable.

The caves are easily accessible via the A1 motorway from Ljubljana, Koper, or Trieste (Postojna motorway exit No. 41, which is two km from the Park).

There are three tours from which you can choose your adventure (see below), ticket prices vary between seasons.

  • Meet the Queen of Caves
    Tour Postojna Cave, the Queen of the Underground World, features a 2 km train ride with a stop to see The Brilliant.
    The price for a single adult ticket is €27,90 in the high season and €25,80 in the low season.
  • Two Adventures
    The package deal includes tours of Postojna Cave and the Predjama Castle, which allows you to see two world-known attractions at once.
    The price for a single adult ticket is €38,50 in the high season and €35,70 in the low season.
  • 100% Cave Experience
    The package deal includes tickets to Postojna Cave, the Vivarium, as well as the Expo Cave Karst and the Butterflies of the World exhibitions. This tour gives you a total dive-in in the world of caves, with all you need and want to know about this underground universe.
    The price for a single adult ticket is €39,20 in the high season and €37,90 in the low season.


The Caves of Škocjan

If you want to explore the caves in a more natural way or even stay for more than one day, then Škocjanske Caves are the ones you want to see and explore. With natural significance and extreme beauty, they were recognized as a true planet Earth’s treasure in 1986. They were entered on a list of natural world heritage sites protected by UNESCO, standing side by side the Grand Canyon and the Great Barrier Reef.

This underground phenomenon was created by the stream of river Reka collapsing underground which resulted in the largest subterranean canyon in Europe (146 m high). Škocjan cave system has many kilometers of trails for visitors with no less than 500 steps. The trail leads you across incredible bridges allowing you to see underground waterfalls (there are no less than 26), grand halls, giant stalactites and stalagmites that have grown to 15 meters in height, and other underground creations made by the karst river.


Škocjan cave
Škocjan Cave system has the largest underground canyon in Europe.


Exploring through a bit more than 6km of this underground treasure, you will also discover two impressive valleys, Velika Valley (165m) and Mala Valley (120m), which were formed about 400 years ago with the cave ceiling collapsing from approximately 200m. They are separated by the only remaining piece of the original cave ceiling forming a natural bridge.

Some of the endangered species of birds and bats have found their home in the surroundings of the collapsed river valley, which forms a unique ecosystem and cave fauna, existing until this day.

There is a second entry to the caves, a 90m drop, abyss, called Okroglica. Just a few meters from that entry lies the village of Škocjan, which gave the caves their name.



The Škocjanske Caves are easily accessible via the A1 motorway from Ljubljana, Koper or Trieste, exit Divača. There is a lot to explore in this natural museum and there are three different tours through the park (see below), each from and in a different direction:

  • Through the underground canyon
    This is a guided underground tour, leading trough 3km of the man-made passageway, visiting two caves, revealing all the formations and finishing with an amazing view over the collapsed valleys.
    This tour runs all year round 10 AM – 1 PM, additional times on Sundays and holidays.
    Prices vary by months, with the fee for a single adult ticket is €16 from November to January, €18 from March to October and €20 in July and August.
  • Following the Reka river underground
    This tour can be done with or without a guide, following the natural entrance of the Reka River. Entering the first part of the cave, beneath the village of Škocjan, you reach the two collapsed valley and have the chance to explore the Tomic Cave, known for its archeological findings. And a bonus of a beautiful waterfall.
    This option is available from April to October 11 AM – 2 PM, extending hours from June to September 10 AM – 3 PM.
    The price is fixed all year round, on €12,50 per adult.
  • Along the Škocjan Educational Trail
    This is a 2-hour circular educational trail you can do on your own or with a guide. It will take you to pass the two collapsed valleys and trough the villages of Betajna, Škocjan, and Matavun. It provides all information about cave formations, flora and fauna, and the rich historical heritage we can find in this area. As a part of this tour, you can visit the museum exhibitions, which we highly recommend.
    These tours are available all year round. For a guided tour a standard €6 adult fee applies and the unguided tours are free of charge.

But ... there's more!

If you are one to explore, hike and stay off the beaten path, we have some suggestions on smaller and lesser-known caves you can visit on your trip around Slovenia. These are mostly free to visit, easy to find and access - usually by a short walk. Those more adventurous can try thrilling caving activities.

Our top 3 picks would be Snežna Cave or the Snow Cave, located right beneath the Raduha Mountain. Secondly, Cave Pekel also called the Hell Cave, located near the third-largest city in Slovenia, Celje. And last, but not least, Križna Cave aka Cross Cave, located on Bloška polica.

Snežna jama RAduha, snow cave Slovenia
Snow Cave is the highest lying and oldest tourist cave in Slovenia.


However, the question remains – which one to choose? 
We're not giving you the answer to that, but we are encouraging you to visit at least one of the caves mentioned above. 


We hope you will take our advice and explore an incredible world beneath our world. And if you do, let us know which one was the best for you.

Written by: 

Martina Mestek

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