The World List of Natural Sites of Tourist Attraction
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 (following the Migovec System) as well as one of its top tourism sites. The caves were created by the Pivka River.
Location: Postojna, Slovenia
The year of entering to the World List of Tourist Attractions: 2018