Blue Crystal Ice Cave
© Francesco Bergamaschi/Moment/Getty Images
Crystal caves
Ice caves occur when freezing-cold underground chambers are permeated by water, which accumulates as ice on the stone surfaces. On the other hand, what we're seeing here is a glacier cave formed within solid ice, its only stone support being the bedrock below. Tunneling under the solid ice of Switzerland's Morteratsch Glacier, this particular cave is one of several here that make popular attractions winter after winter. But a tour of the caves is never the same twice, as they melt and shift during the off-season summer months.
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