Wikipedia: (Slovene: Postojnska jama; German: Adelsberger Grotte; Italian: Grotte di Postumia) is a 24,340 m long karst cave system near Postojna, southwestern Slovenia. The cave was first described in the 17th century by the pioneer of study of karst phenomena, Johann Weikhard von Valvasor, although graffiti inside dated to 1213 indicates a much longer history of use.
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| Postojnska jama, July 2018. |
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