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Giant crystals dwarf researchers in the Crystal Cave. Photo via veoverde

It seems like a Hollywood movie set; perhaps a place for Superman to get a little alone time–but Mexico’s Cave of Crystals is no artificial wonder. Discovered in 2000 when silver miners broke through a wall in a mineshaft, the cave features crystals measuring 30 feet, the largest in the world. Only a handful of geologists have ever had the chance to visit this natural wonder, and it seems likely that few ever will; not only are the conditions inside the cave quite inhospitable, soon it will be filled with water…. Read the full story on TreeHugger
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