It is the largest ice cave in the world extending more than 42km.
The rest of the cave is formed of limestone.
Eisriesenwelt was discovered by Anton Posselt, a natural scientist from Salzburg, in 1879.
He led several expeditions into the caves beginning in 1912, which were soon followed by other explorers.
Tourists began to arrive soon after, attracted by the cave’s sudden popularity.
Later another cabin, the Dr. Oedl House, and paths from Werfen and Tanneck were constructed.
Today the Eisriesenwelt cave is visited by around 200,000 tourists every year.
