Forget everything you think you know about caves. In Slovenia, a subterranean world of breathtaking scale awaits, offering more than just stalactites. Postojna Cave delivers a genuine adventure accessible to all, starting with a train ride.
A Train Ride into the Earth’s Core
The adventure
at Postojna Cave begins the moment you board the world's only double-track cave railway. For over 140 years, this unique train has been whisking visitors deep into the mountain, navigating a 3.7-kilometre journey through vast, cathedral-like chambers and tunnels adorned with magnificent geological formations. The ride itself is a thrilling introduction to the cave's immense 24-kilometre system, created over millions of years by the Pivka River. As the train snakes through the darkness, illuminated galleries reveal a subterranean paradise, setting the stage for the walking tour that follows. This isn't just a simple transport; it’s an integral part of the experience that makes Postojna stand out from any other cave system in the world.
Cathedrals Carved by Water
Once you disembark, a guided walk of just over a kilometre begins on an easy, non-slip path. The sheer scale of the caverns is difficult to comprehend. You’ll wander through the Spaghetti Hall, famous for its thin, delicate stalactites, and the Red Hall, coloured by iron deposits. One of the most awe-inspiring sights is the Great Mountain, an enormous underground cavern filled with towering formations. The tour culminates in the Concert Hall, a massive space with remarkable acoustics that can hold up to 10,000 people and has been used for musical performances. The highlight for many is the Brilliant, a stunning, five-metre-tall, bright-white stalagmite that has become the symbol of the cave. Its glistening surface, caused by a thin film of flowing water, makes it a true natural jewel.
Meet the Legendary 'Baby Dragons'
Postojna is not just geologically significant; it is also the most biologically diverse cave in the world. Its most famous resident is the olm (Proteus anguinus), a blind aquatic salamander that locals once believed to be the offspring of a cave-dwelling dragon. These fascinating creatures, which can live for up to 100 years and survive without food for over eight, are perfectly adapted to a life in complete darkness. While they are born with eyes, they are undeveloped, so the olms rely on their highly attuned senses of smell and hearing to navigate and hunt. A special vivarium section of the tour allows visitors to see these 'baby dragons' up close, offering a rare glimpse into a unique and vulnerable species that exists only in the karst caves of this region.
For the Truly Adventurous
While the classic tour is an adventure in itself, Postojna Cave also offers specialised tours for those seeking a more rugged experience. These adventure tours take small groups off the main concrete paths and into the more hidden parts of the cave system. Equipped with caving gear and headlamps, you can follow in the footsteps of the first explorers through passages like Bertareli's Passage and tour the connected Black and Pivka caves. These physically demanding treks, which can last from three to four hours, offer an authentic caving experience, revealing sections of the cave that most visitors never see. For the ultimate thrill, some tours of the nearby Cave under Predjama Castle even involve climbing, providing a strenuous and unforgettable journey into the deep karst underground.
