The subterranean world is a unique testimony of the Earth’s history. In the ancient world mysterious cavities in the mountains were referred to as ‘the dark underworld’.

Open to the public and set within a karst landscape where the foothills of the Alps merge with the Pannonian Plain, is the largest and longest cave system in Slovenia, Postojnska Jama.

Around five million years ago, planar layers of rock became folded together by movements of the Earth's crust forming mountains and valleys. Changes also began deep down. Surface water seeped into the permeable karst, triggered the limestone and flushed it out. Subterranean water channels emerged and the Postojna caves extended dramatically into further large, wide passages.

In the heart of the Slovenian karst landscape of Kras, below the village of Skocjan, is another of the most important cave systems in the world, the Skocjan Caves into which the Reka River has dug deep into the limestone. This is also a remarkable location, a labyrinth of caves, corridors and halls decorated with stalactites of various shapes and sizes.

Nature created these mysterious caves, wild canyons, giant stalagmites, terraces with sinter basins and collapsed funnels. Only the natural world could produce such amazing beauty.