Top Slovenia Underground Tours

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

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.

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.

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.

There's more to Bled than its lake—this white-water rafting experience is ideal for thrill seekers. Cruise down the Sava River on a morning or afternoon white-water rafting trip. Discover the beauty of Slovenia on this exciting journey through Bled’s unspoiled wilderness, great for all rider levels. With an expert guide, you'll feel confident navigating the bumps of the river.

Explore the fascinating network of subsurface caves during a guided tour of the Postojna Caves and Predjama Castle, leaving from Ljubljana. As you enter the two-million-year-old caves aboard a mini-train, learn about why this is one of Slovenia’s most popular attractions. Walk with your guide and witness bizarre stalactites, stalagmites, and other rock formations that make up the 13-mile-long (21 km) system of underground caves. Also venture to the enchanting Predjama Castle, a famous castle that still clings to Slovenia’s limestone cliffs.

Adventure seekers—this is the experience for you. Spend a day enjoying the outdoor beauty of Slovenia’s Bovec region on this whitewater rafting adventure. Take the stress out of planning transport by having hotel pickup and drop-off provided. Once you get to the sports center, you’ll be given all the necessary rafting gear and a safety briefing is included too. The experience is a great way to access incredible views, and have an exciting outdoor adventure at the same time.

Immerse yourself in nature during this 3-hour guided kayak trip down the Soca River from Bovec. An experienced and professional guide will lead you on a trip you’ll never forget and point out all the magnificent natural wonders of the Soca Valley. You’ll be provided with all the necessary gear and given safety tips on how to paddle the waters of the Soca. Then you’ll set off with your guide to head down the river. A driver will take you back to Bovec at the end of the trip.

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.

Slovenian wines are only just attracting international attention. Yet with a heritage dating back around 2,500 years, the Vipava Valley is a destination worth exploring. On this small-group tour, led by a sommelier guide, learn about winemaking, sample different varietals, explore vineyards and cellars, and discover so much more than you could independently. This full-day tour includes hotel transfers, snacks and wine tastings: lunch is at your own expense.