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Photo: Günther J. Wolf at de.wikipedia, Public domain via Wikimedia Commons
A 10-km-long cave system, at an elevation of 2,686 m the highest cave in Europe. It is one of the rare large caves in the Alps, since the crystalline rock isn't favourable for cave formation. The first 500 m of the cave can be visited by guided tour only, there is also a museum inside one of the chambers as well as a gift shop.
The Spannagel Cave is a show cave near Hintertux, in the Zillertal Alps in the Austrian state of Tyrol. Currently about 10 kilometres of the cave have been discovered; guided tours enable access to 500 metres of the cave. Its entrance lies below the Spannagelhaus, a mountain hut formerly run by the Austrian Tourist Club (ÖTK). The cave and the hut are named after Dr. Rudolf Spannagel, who was the president of the ÖTK from 1902 to 1904.
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