The most spectacular of all caves has to be the Cave of the Crystals located in Chihuahua, Mexico. Lying 300 metres below the surface, the main chamber contains never before seen giant crystals the size of pillars. Some of them reach heights of up to 11 metres and weigh about 55 tons. Formed from magma below the cave, these crystals are said to be as old as 500,000 years. Conditions inside the cave are extreme which call for proper gear when visiting this behemoth structure.
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