All Aboard the Cave Express
The adventure at Postojna Cave begins unlike any other caving experience on Earth. Instead of a steep descent on foot, your tour starts with a ride on the world's only double-track cave railway. For over 140 years, this train has been whisking visitors
deep into the mountain, covering 3.7 kilometres of a vast 24-kilometre cave system. The open-air carriages glide through illuminated tunnels and the first of many massive chambers, revealing a scale that is difficult to comprehend. The train ride itself is a thrilling introduction, building anticipation as it travels further from the sunlit world and deeper into a geological wonderland shaped over millions of years by the Pivka River.
A Cathedral Made of Stone
Once the train journey concludes, you step out into the Great Mountain, a colossal underground hall where the guided walking portion of the tour begins. This is where the sheer artistry of nature is on full display. Guides, who offer tours in several languages, lead you along a well-maintained, non-slip path through a series of chambers, each with its own character. You'll marvel at intricate spaghetti-like stalactites hanging delicately from the ceiling and gaze up at the Skyscraper, a towering 16-metre-tall stalagmite. The most famous formation is the 'Brilliant', a five-metre-tall, dazzlingly white stalagmite that has become a symbol of the cave. The path continues through the Concert Hall, a massive chamber with incredible acoustics that has hosted musical performances, its grandeur accentuated by Murano glass chandeliers.
Meet the Legendary 'Baby Dragons'
Beyond the stunning geology, Postojna Cave is famous for its most mysterious resident: the olm (Proteus anguinus). This rare, blind aquatic salamander is perfectly adapted to life in complete darkness. Local legend once held that these pale, slender creatures were the offspring of a dragon that lived deep within the cave. The tour includes a stop at a vivarium, where you can see these fascinating animals up close. Learning about the 'baby dragons', which can live up to 100 years and survive for years without food, adds a layer of biological wonder to the geological splendour. The cave's conservation efforts are world-renowned, with successful breeding programs in 2016 and 2022 capturing global attention.
Planning Your Underground Adventure
A tour of Postojna Cave lasts about 90 minutes, covering a total of 5 kilometres via train and an easy onendkilometre walk. The path is accessible and suitable for families, though there is a section with a noticeable gradient. One of the most important things to remember is the temperature. The cave maintains a constant, chilly 10°C (50°F) yearround, so dressing in warm layers and wearing comfortable shoes is essential. Booking tickets online in advance is highly recommended, especially during peak season, as tours have timed entry slots. You can also purchase combination tickets that include a visit to the nearby Predjama Castle, a stunning medieval fortress built into the mouth of a cliff.
