America's vast and diverse landscape is obviously incredible to witness aboveground. But descending just below the surface, you can find some equally amazing (if dark and stuffy) natural wonders ...
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This Midwestern State Harbors 14 Magical Caves – And They're More Spectacular Than You Ever ImaginedOpening just after prohibition, Mystic Caverns and the Castle Royal ... We did so at Mill Ruins Park. Niagara Cave is located on the Minnesota-Iowa border. It was first discovered in 1924 when ...
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