Mammoth Cave, the world's longest known cave system, stretches 426 miles under Kentucky. The cave's limestone began forming 330 million years ago when the region was submerged under an ocean. Visitors ...
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This cave is unlike any other, it’s a 426-mile network spanning two countries waiting to be explored
Mammoth Cave, located beneath Kentucky’s rolling hills, is the longest known cave system on Earth, extending a staggering 426 miles (686 kilometers). With a history spanning millions of years, this ...
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