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Discover Slovenia’s stunning underground caves and fairytale castle on this 5-hour tour from Koper, including train rides, expert guides, and photo stops.
A detailed tour of Postojna Cave and Predjama Castle from Koper offers an engaging blend of natural wonder and historical charm. Priced at $80.64 per person, this 5-hour experience includes transportation, entrance fees, and a knowledgeable guide. With a rating of 5.0 based on 27 reviews, it’s highly recommended by 100% of participants, and remains a popular choice, especially for cruise passengers and visitors staying in Koper.
This tour is ideal for those who want to explore Slovenia’s iconic underground cave system and marvel at the unique Predjama Castle built into a cavern mouth. The experience includes a train ride inside Postojna Cave, a walk through breathtaking chambers, and a photo stop at Predjama Castle. The tour is suitable for people with moderate physical fitness, as it involves some walking and steps. Keep in mind, warm clothing is advised, as the caves maintain a temperature around 50°F, and reviews mention the castle can be much cooler.


Postojna Cave is the highlight of this tour, known as Slovenia’s most visited underground site. The cave system features magnificent chambers, galleries, stalactite-lined halls, and awe-inspiring stalagmites. The train ride through the cave is a major feature, allowing visitors to experience the vast underground landscape comfortably.
Exploring the caves takes about 90 minutes, during which the guide explains the bizarre wildlife, including the unique human fish that resides exclusively here. Several reviews mention the size and beauty of the caves, describing them as breathtaking and like something from a movie.
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A standout feature is the electric train that takes visitors into and out of the cave. This short ride offers a comfortable way to begin the exploration, followed by a walking tour on solid concrete paths and stairs. The train ride is often praised for its smoothness and ease, making it accessible even for those less comfortable with extensive walking.

Just a few minutes from the caves, Predjama Castle offers a striking visual contrast. This stone-carved fortress is the only one of its kind in the world, perched within a large cave opening. The tour includes a photostop at the castle, which boasts impressive views and a fairy-tale setting.
While admission to the castle itself is not included, the photo stop provides plenty of opportunity for memorable pictures. Several reviews mention the castle’s dramatic location and its beauty, making it a perfect photo opportunity during the trip.

The tour departs from the Koper Tours cruise port at the Potniski terminal, with pickup and drop-off included. The transportation is with a comfortable, air-conditioned van or minibus, accommodating groups of up to 15 people. This setup ensures a smooth journey, freeing travelers from the hassle of organizing transport.
The group size and private tour format make for a personalized experience, with the guide able to tailor explanations and pace. The small group size also helps maintain an intimate atmosphere, avoiding crowds often found at popular attractions.

Since the caves are consistently around 50°F, wearing warm clothing is essential. Many reviews recommend bringing a sweatshirt or jacket, especially if planning to explore the castle or outside areas afterward.
Photography is allowed without flash, so travelers should bring a camera or smartphone capable of capturing low-light images. The cave provides many photo-worthy moments, but proper lighting and a steady hand are advised.

Guides are praised for their knowledge, friendliness, and storytelling skills. Examples mention guides like Stanley and Luka, who share local history and interesting facts, enhancing the overall experience. The multi-lingual guides ensure clear communication for international visitors.
Guests also appreciate the pacing of the tour, which balances sightseeing with enough time to enjoy each location without feeling rushed. The informative commentary adds depth to the visit, making it both pleasurable and educational.

This tour involves some walking and stairs, aligning with a moderate physical fitness level. It’s suitable for most able-bodied visitors, but those with mobility issues should be aware of the terrain. The well-maintained paths and train ride help mitigate physical strain.

At $80.64, this tour offers excellent value, especially considering all included features: transportation, entrance fees, and a professional guide. The high review rating of 5.0 and the fact that it’s booked 10+ times last week demonstrate its popularity and reliability.
Many reviews highlight the breathtaking nature of the caves, the smooth logistics, and the expert guides. Although the castle visit is limited to a photo stop, the stunning scenery makes it a worthwhile addition to the tour.
This experience appeals most to visitors seeking natural wonders and historical sites in a compact schedule. It suits cruise passengers with limited time, families with children who can handle moderate walking, and anyone curious about Slovenia’s underground landscapes and medieval buildings. Weather conditions, like the cold caves, should be considered when packing.
This tour combines Slovenia’s most famous underground cave system with the dramatic Predjama Castle, offering an engaging and scenic half-day trip. The train ride, guided explanations, and photo opportunities make it particularly appealing.
While it doesn’t include entry to the castle interior, the photo stop captures the castle’s striking silhouette and offers a memorable snapshot. The convenient pickup from Koper and small group size contribute to a smooth, personalized experience. If you’re looking for a well-organized, visually stunning tour of Slovenia’s highlights, this option is hard to beat.
“Cave tour was great but make sure you bring something warm as it is 50 degrees farenhight. Was not able to visit inside the Castle as time did not…”
Is this tour suitable for children?
Yes, children can enjoy the tour, but they should be capable of walking on stairs and uneven paths. The moderate physical activity and cold environment should be considered.
Do I need to bring warm clothing?
Absolutely. The caves are kept around 50°F, and many reviews emphasize the importance of wearing a sweatshirt or jacket to stay comfortable during the visit.
Can I visit the castle interior?
No, this tour only includes a photo stop at Predjama Castle. Entrance fees for the castle itself are not included, and the tour does not extend into the interior.
What is the group size?
The tour is a private activity with a maximum of 15 people, providing a more intimate experience with personalized attention from the guide.
How long does the tour last?
The entire experience takes about 5 hours, including transportation, the cave exploration, and the photo stop at the castle.
This tour offers a convenient, memorable way to explore some of Slovenia’s most remarkable sights, combining natural beauty, history, and ease of access from Koper.