Top Slovenia Underground Tours

This experience is great for nature lovers and architecture fans alike. Visit two important Slovenian attractions in a day—Postojna Caves and Predjama Castle. No need to worry about waiting in long ticket lines, as this convenient package includes admission to both sights. Once inside, enjoy guided tours to discover Postojna’s underground tunnels and cave train, and learn about Predjama Castle’s medieval history.

Postojna Caves are the second largest underground cave system in the world. Unique for its cave train which isn't to be found nowhere else in the world. Predjama Castle is situated close to the caves and it is one of the most spectacular medieval castles and the biggest cave castle in the world.

Get off the boat and spend a day in the Slovenia with this private full-day shore excursion to Postojna Cave and Ljubljana from Koper. An experienced local guide will meet you at port and take you one of the country’s best natural wonders, like karst caves, full of cavernous rooms and halls. After spending time exploring the cave system your tour will continue on to the marvelous city of Ljubljana, Slovenia’s capital and a city ripe for exploring. Make stops at the Franciscan Cathedral, the fountain of Francesco Robba and Town Hall, among other places. You’ll have time to explore the city and do some shopping before driving back to port.

Tick off two of Slovenia’s top attractions in just one day on a private day trip from Ljubljana. Ideal for first-time visitors and time-pressed travelers, this tour guarantees the undivided attention of a private guide and grants yu access to one of the largest cave networks in the world. Plus, all admission tickets are included so you won’t be surprised by any hidden charges.

Visit Slovenia’s Postojna Cave and Predjama Castle from Ljubljana without the bother of using public buses or trains. Admire the scenery as you travel to Postojna by air-conditioned vehicle, and hear background from your guide en route. Then, roam the stalactite- and stalagmite-filled caverns by underground train and foot as you hear their history before exploring 13th-century Predjama Castle, built into cliffs. Entry fees and choice of departures included.

Explore a maze of underground caverns and a dramatic cave fortress on a tour from Portoroz to Postojna Cave and Predjama Castle. Combining the two adjacent destinations makes the most of your time on the road, but coordinating transport with a busy sightseeing schedule can be a headache; take advantage of a flexible departure time, then relax and enjoy the view as you discover one of Slovenia’s most scenic areas.

Lipica Stud Farm is an experience you should not miss. The unique estate of Lipica has more than 350 Lipizzaner (horses) and 435 years of tradition. Postojna Caves are the second largest underground cave system in the world. Unique for its cave train which isn't to be found nowhere in the world.

What makes this tour truly unique is that it tells the complete story of Slovenia — nature, legend, and living city life, all in one perfectly balanced experience. In Postojna Cave, you don’t just walk underground — you ride a train into a hidden world of colossal chambers, shimmering formations, and millions of years of natural history. Just minutes away, Predjama Castle rises dramatically from a vertical cliff — the largest cave castle in the world. Built into living rock, it blends architecture and nature in a way found nowhere else with stories of secret tunnels, sieges, and the rebellious knight Erazem, proving that truth can be even more thrilling than fiction. The journey ends in Ljubljana, a city that surprises everyone. Small, elegant, and relaxed, its car-free old town, riverside cafés, and iconic bridges create an atmosphere that feels both historic and alive. One country. Three icons. One unforgettable experience.

Visit Postojna Cave, the best-known cave in the world, and The Predjama Castle, the only preserved cave castle in Europe.