One Of The World's Largest Underground Canyons Is A Slovenian Gem Of Surreal Subterranean Trails

There are many reasons to visit Slovenia this summer. Not only does it boast incredibly beautiful and under-the-radar coastlines with excellent seafood, as well as being home to one of Europe's oldest national parks, Slovenia is a tapestry of rolling green hills, crystal clear lakes, and fascinating history that is often overshadowed by its neighbors Italy, Austria, and Croatia. But tucked away in the green, forested heart of southwestern Slovenia is one of Europe's best-kept secrets, the Škocjan Caves, an incredibly impressive subterranean wonder that has earned its place amongst some of the world's natural marvels.

Slovenia's Karst region, a limestone plateau with unique geological formations, houses this unique wonder. The Škocjan Caves, formed over millions of years by the Reka River, offer a dramatic and authentic insight into the world's largest known underground canyon, a void filled with rivers that plunge into darkness and chambers as tall as buildings. This UNESCO World Heritage Site is a voyage into Earth's hidden depths.

Boasting a 7.5-mile-long labyrinth of caverns and underground passages, this subterranean gorge plunges 479 feet into the ground, making it the largest underground canyon in Europe. This geologic marvel has become one of significant scientific importance, as well as a hotspot for eco-tourism, since its recognition as a UNESCO World Heritage Site in 1986. Archaeological discoveries suggest the caves were considered sacred sites by people as far back as the Bronze Age. Historians have uncovered evidence that the caves were revered as a site of ritual worship, with offerings including pottery and human remains discovered in their depths. Not only this, but the underground biosphere is also home to a unique range of troglobitic species (cave-dwelling animals) such as the olm, a rare blind amphibian that can live to 100.

A journey to the caves is like plunging into a fantasy. Beginning at the visitor center,the tour will take you through various caverns and across the Cerkvenik Bridge, a narrow stone bridge towering over 160 feet above the river. On a guided tour, you'll have the opportunity to take some photos of this magnificent natural wonder, though your memories are guaranteed to last forever. The caves are open every day between 10 a.m. and 3 p.m. Tickets cost around $25 for adults (with discounts for children and seniors) and include a tour with a guide.

The caves are easily accessible via the neighboring cities of Trieste and Ljubljana. From Ljubljana, you can reach Škocjan Caves by driving around 45 miles southwest, while from Trieste, taking the A1 motorway 20 miles will lead you to the site. By train, you can reach Škocjan Caves from both cities, getting off at Divača Railway Station. From here, the caves are about a 30-minute walk. For those traveling by car, parking is also available at the visitor center.

Around the site of the caves, you'll find some exceptional local cuisine. If you don't mind driving a bit, try Gostilna pri Zotlarju, a family-run restaurant specialising in karst dishes such as local trout, štruklji (rolled dumplings), and homemade pasta dishes. Otherwise, the onsite Ambrožič Restaurant is sure to please with classic burgers or truffle gnocchi. Just a stone's throw from the caves is the Hostel Škrla, offering rustic, no-frills accommodation. Or venture further afield to Pri Andrejevih Farm, a local farmstead where you can enjoy the area's peaceful countryside setting and some homemade wine and cheese.

Beyond its immense immediate power, the Škocjan Caves offer a rare blend of tranquillity, scientific intrigue, and spiritual beauty. Whether you're a nature enthusiast, historian, or someone simply in search of something new, this extraordinary underground landscape will not disappoint, proving once more that Slovenia is one of Europe's most criminally overlooked holiday destinations.