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Postojna Cave | Slovenia

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Postojna Cave is a 24,340 m (79,860 ft) 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.

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. In 1818, when the cave was being prepared for a visit by Francis I, the first Emperor of the Austria-Hungary, a new area of the cave was discovered accidentally by Luka Čeč, a local man in charge of lighting lamps in the cave. In the 1850s, the Austrian-Czech geographer Adolf Schmidl published the first comprehensive scientific overview of the Postojna caves and the Pivka Basin, which became a standard reference point in the study of speleology. Postojna Cave was carved by the Pivka River over millions of years. There are stalagmites, stalactites, and formations called curtains or draperies that look like folded curtains. The cave system is 24.34 kilometers (15.12 mi) long and is made up of four caves interconnected through the same underground river. However, according to speleology rules, the passages and siphons connecting the caves must be walked or swum through by man for them to be considered one whole. Connecting two of the main cave systems will make this the longest cave system in Slovenia and one of the longest in all of Europe. There remain 400 meters (1,300 ft) between the two caves, which would make the cave system between 31,000 meters (102,000 ft) and 35,000 meters (115,000 ft) long.

The caves are also home to the endemic olm, the largest troglodytic amphibian in the world. The tour through the caves includes an aquarium with some olms in it. On January 30, 2016, a female olm at the cave began to lay over 50 eggs. This rare event led to global news about Postojna Cave and the olm. From the end of May to mid-July 2016, twenty-two baby olms successfully hatched. While the cave system is 24 km long, only 5 km is open to the public. Of this, 3.5 km is traversed by a train that takes visitors through the cave; the remaining 1.5 km can be navigated on foot and with a guide. The whole tour takes about 1.5 hours. The temperature inside the cave is around ten degrees Celsius (fifty degrees Fahrenheit).
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