The Most Visited Cave: Postojna Cave
The Postojna Cave is undoubtedly the most visited cave in Slovenia, drawing tourists from around the globe. This world-renowned natural monument features a network of intricate passages and stunning limestone formations, sculpted over millions of years. Visitors can explore this mesmerizing landscape by taking a unique train ride through the cave, followed by a guided walking tour that unveils its breathtaking stalactites and stalagmites. Postojna is also home to the curious olm, or “human fish,” a rare amphibian that lives in its depths.
Postojna vs. Škocjan: Which is Better?
When it comes to choosing between Postojna and Škocjan Caves, each offers a distinct experience worth considering. Škocjan Caves are designated as a UNESCO World Heritage site and boast the largest known underground canyon in the world. This miraculous natural wonder presents a more rugged, adventurous feel compared to the easily accessible and tourist-friendly Postojna. The choice between the two depends on personal preference: if you seek ease and iconic beauty, Postojna may be the better choice. However, for those chasing adventure and a sense of exploration, Škocjan might be more appealing.
Are Škocjan Caves Worth Visiting?

Absolutely. Škocjan Caves, with their enormous underground chambers and river canyons, offer one of the most impressive examples of karst topography. Walking through the caves is akin to stepping into another world, where the natural forces of erosion and geology display their full power and elegance. The grandeur of this underground world leaves a lasting impact on its visitors, making it well worth the trip.
Other Notable Slovenian Caves

Beyond Postojna and Škocjan, Slovenia’s cave system has other remarkable sites. The Kostanjevica Cave, with its splendid stalactite formations, provides a serene experience and a chance to appreciate nature’s artistry. Meanwhile, Vilenica Cave, celebrated for its annual literary award ceremony, inspires with its unique dance hall and colorful dripstones, sparking the imagination of artists and visitors alike.
Planina Cave (Planinska jama), located near the town of Planina, is Slovenia’s longest water cave and features an impressive underground confluence where two rivers meet in darkness. With its vast chambers and rich biodiversity, including the endemic olm or “human fish,” it represents one of the most important underground ecosystems in Europe.
Križna Jama offers a more exploratory experience with its series of emerald-green lakes. Guided tours offer insight into the ecological and historical significance of the cave, including the remains of ancient cave bears found within.
The Largest Cave in the World: Slovenia’s Subterranean Marvel
While Slovenia might not host the largest cave in the world by some metrics, it certainly holds massive underground spectacles. The Škocjan Caves are among the largest karst caves on the planet, with their deep canyons and vast chambers. However, when it comes to the sheer size of a single space, the distinction of the largest cave chamber globally is held by caves elsewhere. Yet, Slovenia’s collective cave systems are nonetheless some of the largest and most magnificent, deserving of worldwide recognition.
Exploring Slovenia’s caves is an invitation to marvel at the wonders of time and nature. Each cave holds its unique allure, a testament to the diverse and ancient forces that have shaped this enchanting European country. Whether you’re journeying on a train through Postojna or hiking the grand halls of Škocjan, the unforgettable beauty of Slovenia’s caves is waiting to be discovered.