It is the largest contact cavity between two different types of rock which may be visited in Europe. Its galleries, furrowed by and underground torrent, wind their way for 8 kilometres, of which one part is illuminated and easily visited; it is possible to admire numerous eccentric stalactites, which seem to challenge the gravity laws.Besides guided visits on the tourist route, lasting 1 hour and 15 minutes, it is also possible, by booking, to carry out speleotourist excursions to the deepest parts of the cave, lasting 3 or 5 hours (this service is currently unavailable), with guides and equipment provided by the Gruppo Esploratori. The temperature inside the cave is all year round about 11° C.
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