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—translucent beams of gypsum as long as 36 feet (11 meters).http://news.nationalgeographic.com/news/2007/04/photogalleries/giant-crystals-cave/index.html
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