Postojna Cave

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Postojna Cave (Slovenian: Postojnska jama) is a 20,570 m long Karst cave system near Postojna, Slovenia It is the longest cave system in the country as well as one of its top touristic sites.

The caves were created by river Pivka.

The cave was first described in the 17th century by Janez Vajkard Valvasor, and a new area of the cave was discovered in 1818 by Luka Čeč. Electric lighting was added in 1872, enhancing the cave system's popularity. Later, rails were built for the touristic trains. 5,3 km of the cave is open for public.