★ 4.7🇸🇮 PostojnaSuggested visit 2-3 hoursBest season Open year-round; the cave stays cool in summer
Natural wonderCaveGeology
A 24-kilometre karst cave system reached by underground train, with giant formations and the endemic olm.
Overview
Extending about 24 kilometres, Postojna is among Europe's best-known karst caves. An underground train covers roughly 3.7 kilometres, followed by 1.7 kilometres on foot past formations tens of metres tall, along halls and corridors. The cave shelters the endemic olm, sometimes called the baby dragon, which can be seen in the on-site aquarium.
History
Discovered in 1818 by locals preparing for an imperial visit and opened to the public in 1819, it was among the first caves in the world to offer guided tours and a railway.
Highlights
•The underground train
•Giant stalactites and stalagmites
•The underground concert hall and corridors
•The olm aquarium
Practical tips
•The cave stays around 10°C — bring a jacket
•Flash is not allowed; raise your ISO for photos
Practical information
Best time
Year-round
Tickets
About EUR 30 for adults including the train
Opening hours
9:00-17:00 (fewer departures in winter)
Local food
Halusky, pumpkin seed oil salad, potica cake
Getting around
About an hour by train from Ljubljana; the station is a ten-minute walk from the entrance.
Visa
A Schengen visa is required; apply about one month in advance.