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World's most awe-inspiring caves

The natural world can be pretty spectacular, but what we see on the surface isn't even the half of it. Deep underground, hidden away in mountain caves, or submerged underwater is where you'll find some of the world's most awe-inspiring natural wonders. From giant crystals to glowworm-illuminated crevasses, there are truly miraculous sights just waiting to be explored. These are seven of our favorite natural discoveries. | Amanda Oppold

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