A superman fan's dream come true...
Buried a thousand feet (300 meters) below Naica mountain in the Chihuahuan Desert, this astonishing cave was discovered by two miners only in the year 2000.
A sort of south-of-the-border Fortress of Solitude, Mexico's Cueva de los Cristales (Cave of Crystals) contains some of the world's largest known natural crystals.
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