In 60 seconds
Hailed as the 'Queen of the Karst World', Postojna Cave (Postojnska jama) is Europe's most visited show cave, a subterranean labyrinth of over twenty-four kilometres carved over millions of years by the Pivka River. Since 1872, visitors have glided into this subterranean wonder on the world's only double-track underground cave railway, whisking travellers through cathedral-scale chambers draped in millions of calcified needles. The tour leads on foot beneath the immense five-metre-tall, gleaming white 'Brilliant' stalagmite and past glass vivariums sheltering the enigmatic olm (Proteus anguinus) — the blind, pale 'baby dragon' amphibian that lives for up to a century in total darkness. Just nine kilometres away, the cliffside drama continues at Predjama Castle, a four-story Renaissance fortress built directly into the mouth of a gaping 123-metre vertical cavern.
Best for
Known for
Skip if
You suffer from severe claustrophobia or dislike managed tour groups; Postojna is an organized, high-volume natural wonder.
Your match
Choose a few travel interests and we will show how well Postojna Cave fits them. Choose interests
See
The things that would make the trip incomplete without them.
24-kilometre karst cave system explored via open-air electric train and subterranean footpaths
Ride the exhilarating 3.7-kilometre electric train beneath glittering rock arches before walking to the iconic 'Brilliant' stalagmite.
800-year-old medieval stone fortress built halfway up a vertical 123-metre limestone cliff
Cross the drawbridge into rooms hewn straight from natural rock and discover the secret cave tunnel used by robber baron Erasmus.
Subterranean biospeleological research station and exhibition dedicated to cave-dwelling fauna
Observe live olms swimming in specialized darkness tanks alongside blind cave beetles and transparent shrimp.
Eat
A short list, kept short on purpose. Each entry answers one question: when is this the right choice?
Too few picks yet for their own heading, so they share this list.
Country inn situated directly opposite Predjama Castle with dining rooms looking straight at the cliff face
Feast on tender wild game goulash and handmade Idrija potato žlikrofi while enjoying an unhindered view of the cave castle.
Contemporary restaurant beside the cave entrance serving gourmet burgers, Karst prosciutto, and craft beers
A stylish modern dining terrace serving wind-dried Kraški pršut platters and hearty slow-cooked beef stews.
Fascinating Cold War-era hotel lounge with an interactive exhibition of preserved Yugoslav secret police wiretapping suites
Enjoy espresso before joining the guided tour into the authentic, unaltered secret police eavesdropping chambers discovered inside the hotel.
Beyond the obvious
Less obvious, rarely queued for, and usually the part people remember.
Fascinating regional museum displaying the only fully preserved Pleistocene cave-bear skeleton and karst hydrology models
Stand before the complete skeleton of a prehistoric giant cave bear recovered from the depths of local limestone caverns.
Phenomenal vanishing lake that disappears into subterranean karst sinkholes in summer and refills in autumn
Witness one of nature's greatest karst curiosities twenty minutes east: a vast lake where locals fish in spring and mow grass in summer.
Stay
Areas rather than hotels — pick the right one and the rest follows.
Surrounding the cave entrance, park gardens, and Pivka riverbank
Stay right at the attraction gates to beat morning coach arrivals and wander the illuminated grounds after hours.
Quiet town district one kilometre from the cave entrance with guesthouses and railway station
Economical and convenient for travellers arriving by rail from Ljubljana or Trieste.
Practical
Plan this trip — useful links
Context
Enough to make what you are looking at legible.
Local lamplighter Luka Čeč accidentally discovers the vast inner caverns of Postojna Cave while preparing for a visit by Austrian Emperor Francis I.
The world's first cave railway tracks are laid down inside Postojna Cave, initially pushed by manual guides before electrification in 1914.
Predjama Castle enters the Guinness World Records as the largest cave castle on Earth.
Further out
Worth a day if you have one to spare.
Military museum complex housing Cold War tanks, MiG fighters, and a Yugoslav P-913 saboteur submarine
Climb inside the cramped hull of an authentic 1980s Yugoslav miniature submarine.
