Giant crystals in a cave that resemble Superman's Fortress of Solitude

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The Crystal Cave in Mexico contains gigantic white crystals the size of lighthouses. It could very well be a set for the Superman Returns movie. Is the cave open to tourists? How can this rare environment be protected. See how a man in the cave is dwarfed by the crystals! Enter the link below. http://macrocosm-magbook.blogspot.com/