About This Tour
The mystic underground of the Postojna Cave, most notorious karst cave in the world, with the Predjama Castle, listed among the Guinnes World Records as the largest cave castle, and home to the local "Robin Hood", the brave robber baron Erazem. The guided tour of Postojna Cave will consist of a ride by electrical train and a walk through beautiful underground passages and chambers with spectacular drop stones, pillars, limestone curtains and other natural stone forms. Continue to the idyllic village of Predjama, where you will be amazed by our fairy tale medieval Predjama Castle, famous for its dramatic setting in the gaping mouth of a cavern halfway up a hillside. Learn about the legend of Erasmus - "Slovenian Robin Hood" and return to the port.
Photo Gallery





TopTours Insights
Postojna cave & castle | Private off cruise excursion from Koper
Let TopTours AI read the full tour details and generate a short insight about who this experience is best for and what stands out.
Calculating tour characteristics...
What's Included
What's Not Included
Additional Information
Cancellation Policy
For a full refund, cancel at least 24 hours before the scheduled departure time.
Tour Operator
Roundabout Travel
Official supplier for this experience. Bookings are handled directly through Viator with verified partners.
Viator Certified
Trusted local operator
Are you the tour operator?
Get up to 15× more visibility by linking your tours together. Show travelers all your offerings on each tour page. Just one extra booking per month covers the cost. Starting at just $4.99/month.
Guest Ratings
Total review count and overall rating based on Viator and Tripadvisor reviews
Based on 1 verified reviews
Average rating
Frequently Asked Questions
Common questions about Postojna cave & castle | Private off cruise excursion from Koper
Who operates this experience?
This experience is operated by Roundabout Travel, a local sightseeing provider.
What's included?
This tour includes Private transportation, Cruise port pickup and drop off, and Private driver/guide. All inclusions are provided by the tour operator.
How long is this tour?
The experience lasts approximately 8 hours, giving you time to fully enjoy your chosen activity.
Can I cancel this tour?
Yes, you can cancel up to 24 hours before the scheduled departure time for a full refund.
What should I bring?
We recommend bringing comfortable walking shoes, a camera, and weather-appropriate clothing. All necessary equipment is provided.
Is transportation included?
Yes, transportation is included. Hotel pickup and drop-off are typically provided.
Will I receive instant confirmation?
Yes, you'll receive instant confirmation when you book.
What to expect on this tour?
This sightseeing experience lasts approximately 8 hours and includes all necessary equipment and guidance. You'll have access to Private transportation and more.
Ready to Go?
Book Postojna cave & castle | Private off cruise excursion from Koper
Secure your spot instantly through Viator and receive flexible cancellation options plus verified customer support.
Trusted partner • Instant confirmation

