The Postojna Cave is a complex of 20 kilometres of tunnels filled with stalactites, galleries and halls, into which experienced guides have led more than 31 million visitors during the 185 years. This is the biggest cave in classic Karst, and at the same time, the most visited tourist cave in Europe.

The Postojna Cave is the only cave in the world operating a cave train, so visitors can admire the immensity and the powerful allure of the underground world, where the geological past is revealed to visitors in its own way while riding a train. Their gazes are filled with the innumerable richness of stalactites of various shapes, colours and generations, calcareous sinters and other works of art which nature developed over millennia, and which had been admired in the previous centuries by kings, caesars, presidents of countries and other important people.

Since the middle of 17th century, the Postojna Cave has been a point of interest for natural scientists and explorers, and thus it is also known as the cradle of speleobiology, the science of life in the underworld.The visitor's curiosity is satisfied by facts about the formation of caves, a guided visit through passages and chambers and, above all, by observing the stalactites hanging from the ceiling, the stalagmites growing up from the floor, the pillars formed when stalactites and stalagmites meet, the folds of calcite curtains and the other sequences of fantastic shapes and forms.

The desire for knowledge has also prompted experts in karst phenomena and life in the karst to research the special geological features of the cave, the formation and development of speleothems (the generic term for calcite formations in caves), and the living creatures that are found in caves - both those that have strayed underground by chance and those that have adapted to life in eternal darkness.

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