Mexico's Cave of Crystals stunned geologists when it was first discovered in 2000. The underground chamber contains some of the largest natural crystals ever found. Britain's Professor Iain Stewart got a rare glimpse of the subterranean spectacle while filming for the new BBC series How the Earth Made Us. Check out the BBC video clip on this link.
http://news.bbc.co.uk/2/hi/science/nature/8466493.stm
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