Postojna Cave - Slovenia - WonderOUT
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Postojna Cave – Slovenia

Borobudur Temple – Indonesia
December 6, 2017

Postojna Cave is a 24,340 m long karst cave system near Postojna, southwestern Slovenia. It is the second-longest cave system in the country as well as one of its top tourism sites. The caves were created by the Pivka River.

A fantastic web of tunnels, passages, galleries and halls, the astonishing diversity of Karst features as well as easy access are certainly the main reasons for such popularity of the cave and a large number of visitors, which has already reached 38 million in 200 years.


Postojna Cave was carved by the Pivka River over millions of years. There are stalagmites, stalactites, and formations called curtains or draperies that look like folded curtains. The cave system is 24 km long and is made up of four caves interconnected through the same underground river. However, according to speleology rules, the passages and siphons connecting the caves must be walked or swum through by man for them to be considered one whole. Connecting two of the main cave systems will make this the longest cave system in Slovenia and one of the longest in all of Europe. There remain 400 meters between the two caves, which would make the cave system between 31,000 meters and 35,000 meters long.

The caves are also home to the endemic olm, the largest troglodytic amphibian in the world. The tour through the caves includes an aquarium with some olms in it. On January 30, 2016, a female olm at the cave began to lay over 50 eggs. The olm (Proteus anguinus) has always excited people's imagination. Initially, it was believed it was the dragon's offspring brought onto the surface by high waters.

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For many years, visitors were able to explore the cave only on foot. In the spring of 1857, when the cave was visited by the imperial couple, three velvet sedan chairs were made for Empress Elisabeth and her ladies-in-waiting. In 1872, the tracks were laid all the way to the Great mountain (at the time known as the Calvary), giving visitors the option of a ride in two-seater carriages, which were pushed by the cave guides. Although the idea of introducing machines instead of man-power was present even prior to World War1, it was not realised until 1924, while the year before the entire railway system inside the cave was overhauled.


Take a train into the magical subterranean world

A legendary tourist train takes you to the underground network of karst tunnels, galleries, and halls. Postojna Cave is the only karst cave with a cave railway. For 140 years it has been taking visitors to see stalactites and stalagmites and other features created by water.

Christmas in the karst subterranean world

Postojna Cave boasts incredible subterranean halls. In one of them, the largest live nativity scene in the subterranean world can be seen at Christmas time. More than 500 performers put on this Christmas show among stalactites and stalagmites.

Visit the offspring of dragons

More than 150 animal species live in the karst caves of Slovenia, and the largest among them is the human fish (Proteus anguinus). The only European underground vertebrate can live for up to 100 years and can survive without food for years at a time.

Predjama Castle and its hidden cave entrances

Predjama Castle is located in the vicinity of the Postojna Cave and is the largest cave castle in the world. Mysterious underground tunnels connect it with the cave directly beneath.

Knight tournaments and medieval days

Every summer, Predjama Castle is the location of Erazem’s Knight Tournament, in which knights, archers, swordsmen, and horsemen show their fighting abilities and the historic way of life at a knight’s encampment.


Jamska cesta 30, 6230 Postojna, Slovenia
  • Nearest City: Postojna 1.3 Km
  • Nearest Airport:
    Airport Jože Pučnik - Liubliana: 54.1 km
    Airport Trieste - Friuli Venezia Giulia: 57.7 km
    Airport Rijeka: 67.7 km
  • Nearest Train Station: Postojna Train Station: 2.5 Km
  • Website: Postojna Caves

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