Postojna Cave & Predjama Castle: Experience Slovenia's Underground Beauty & History

Explore the breathtaking beauty and rich history of Slovenia’s Postojna Cave and Predjama Castle. Ride an electric train through the 21 km long cave system and marvel at its stunning formations. Discover the fascinating world of the Proteus Anguinus, the ‘baby dragon’ of the underground.

Duration: 6 hours
Cancellation: 24 hours
Highlights
  • Postojna Cave - Postojna cave entrance fee
  • Predjama Castle - Predjama Castle entrance fee
What's Included
  • Entrance to Postojna Cave
  • Entrance to Predjama Castle
  • Audio guide in Predjama Castle
  • Skip the line service
  • Pick up and drop off service in central Ljubljana
  • English speaking driver/guide
  • In-vehicle air conditioning
What's Not Included
  • Food and drinks
  • Your personal expenses
Additional Information

On this day we take you to the biggest and worldwide known Slovenian cave system - the Postojna caves. Amazing two million years old and 21 km long system of underground caves is one of the most easily accessible networks of underground caves in the world. First, you will experience the ride by electric train, after that, a guided walk will follow…

Location
Postojna Cave
Jamska cesta 30
Cancellation Policy

For a full refund, cancel at least 24 hours before the scheduled departure time.

Customer Ratings
4.8
(817 Ratings)
5 stars
4 stars
3 stars
2 stars
1 star
Maribel_c
Jul 23, 2025
Must See Tour - The Predjama Castle was very interesting. The Postojna Caves was more than what my family and I expected. It was amazing! Tour was seamless, thanks to Klenen. Great experience overall!
Review provided by Viator
Stevened3013un
Jul 20, 2025
- My guide was great and the sites were amazing. I would highly recommend it to anyone. Just make sure to bring a jacket with you
Review provided by Tripadvisor
Millie
Jul 18, 2025
Amazing Day at Postojna Cave & Predjama Castle! - Postojna Cave was incredible – the train ride inside was super fun! Predjama Castle was so cool and built right into a cliff. Luca, our guide, was hilarious and made it even better. You definitely have to visit if you’re in Slovenia!
Review provided by Tripadvisor
Danielleaf9546lc
Jul 18, 2025
- Highly recommend this tour to anyone visiting Slovenia! The Postojna Cave & Predjama Castle are must-see attractions - both are breathtaking. Our tour guide was organized and so knowledgeable. He shared interesting and helpful information during the comfortable drive with an excellent driver from Ljubljana to the attractions and everything was as advertised.
Review provided by Tripadvisor
Seaside57754192083
Jul 18, 2025
- Our tour leader Kay’s was wonderful. Made the tour very interesting by sharing trivia with us. The caves of course are spectacular. No one should miss them!!
Review provided by Tripadvisor
Vanessa_g
Jul 17, 2025
Juste WOW - Beautiful - nothing to add!! The castle and caves are absolutely breathtaking.... A big thank you to To do in Slovenia and their fantastic guides for their care and especially their unparalleled customer service!
Review provided by Viator
A7115mnmatthewm
Jul 17, 2025
Definitely worthwhile! - The tour van was very full but still comfortable. Our driver and guide Miha is Slovene, and he was terrific....very welcoming and gracious. On the drive from Ljubljana to/from the sites we learned much from him. As expected, the sites were quite crowded, but all managed well and super well-organized. The people working there all seem invested, rightfully proud of their Slovene heritage, and eager to help. There is a significant amount of walking in the group-guided cave tour and lots of stairs in the self-paced castle tour. Be advised that there were not a lot of places to sit and rest in either one except for outside the sites. This combined tour took just over five hurs from pick-up to drop-off in convenient Ljubljana center locations.
Review provided by Tripadvisor
Tara_m
Jul 15, 2025
Amazing! Especially our tour guide George - This was a wonderful excursion. Our guide George made it interesting and fun! Overall the day was very well organized and worth the cost!
Review provided by Viator
U1468visaskiav
Jul 15, 2025
Top day to special locations with an experienced guide, from me they get a 10 - Wonderfully comfortable bus, suitable for 8 people, we were with a smaller groups. The guide Rokko knew a lot about Slovenia and told a lot along the way. The castle was particularly the caves immense and beautiful. On the way back our guide gave all kinds of tips for Slovenia.. the atmosphere was cozy and would recommend everyone to do this tour with To do in Slovenia 🥰
Review provided by Tripadvisor
955clevelander
Jul 23, 2025
Great visits but uncomfortable ride. - Our driver was excellent, giving history and pointing out important things. The only reason not 5 star is that the coach ride was uncomfortable due to squashing into back seat.
Review provided by Tripadvisor
From $128
up to 15 guests
1 - Adult
Cancellation: Free cancellation up to 24 hours before the start of your experience (local time).