High in the Austrian Alps, above the town of Werfen, lies Eisriesenwelt, the world’s largest ice cave. It is a dynamic ice cave, with its formations constantly changing, and each year, from May 1 to Oct. 26, visitors can take a 70-minute tour of part of the 40-kilometer cave system, seeing enormous ice formations as well as stalagmites and stalactites of ice.At the base of the mountain, visitors begin at the Besucherzentrum (Eishohlenstrasse 30, 5450 Werefen, Austria; phone +43 6468...
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