High Quality Content by WIKIPEDIA articles! Postojna Cave (Slovene: Postojnska jama; German: Adelsberger Grotte; Italian: Grotte di Postumia) 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 tourism sites.The cave was first described in the 17th century by Johann Weichard Valvasor (Slovene: Janez Vajkard Valvasor), and a new area of the cave was discovered accidentally in 1818 by local Luka ?e?, when he was preparing the then known parts of the cave for a visit by Francis I, the first Emperor of Austria.

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