This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated. LIMESTONE COUNTY, Ala. (WHNT) — The ...
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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