The World beneath the Surface of the Earth

Follow the River Pivka and set out on a journey into the centre of the Earth much like Indiana Jones. Cave passages and galleries abundant with speleothems, magnificent halls and the subterranean fauna will feed your adventurous spirit.

Slovenia boasts more than 11,000 caves, including Postojna Cave, which is considered to be the most beautiful cave in Slovenia. Its well-deserved reputation has been attracting large numbers of visitors from all over the world for over two hundred years. The parts of the Postojna Cave System that have been explored so far are 24 kilometres in length, which makes Postojna Cave the largest and most visited cave of the Classical Karst in Europe. Its picturesque and mysterious underground world makes for a unique place for a wide variety of cave adventures.

The Dinaric Karst as a whole - which the Slovenian subterranean Karst world, and Postojna Cave, are a part of - has submitted a nomination proposal to be considered for inclusion in UNESCO’s World Heritage List.

'Everything is created as if it was made by the most gracious, most educated artist; and yet this miracle was created by the blind nature in complete darkness.'

Dr. E. H. Costa


  • 01 Podzemni svet 1a
  • 01 Podzemni svet 1b
  • 01 Podzemni svet 1c

Speleothem Growth

The cave interior is largely shaped by speleothems, cave formations. Their growth is extremely slow: it takes decades for a speleothem to grow a single mm and centuries to grow 1 cm. The speleothem growth is thus measured in millions of years.

There are several different formations: stalagmites that grow from the cave floor, and stalactites that grow from the ceiling. Given enough time, these formations can meet and fuse to create pillars.