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These 3 hidden spots in Mammoth Cave National Park feel like a secret

So many of the hidden spots in Mammoth Cave National Park lie beneath the surface. This popular park in Kentucky is home to ...
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Scientists Discovered a Tiny, Ancient Shark Fossil Deep Inside the World's Longest Cave System

Add Yahoo as a preferred source to see more of our stories on Google. The fossil was found in the Ste. Genevieve Formation, which dates to approximately 335 to 340 million years ago. It was discovered ...
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This National Park Is Home to the Longest Cave in the World—and Only 426 Miles Have Been Explored So Far

Every single one of America’s national parks is unique, with a beauty that’s entirely its own. “The park's cave system is the longest in the world, stretching over 426 miles, and offers visitors a ...
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From Hiking, Biking and Cave Tours: Top 11 Things to Do Mammoth Cave National Park in Kentucky

Located in Central Kentucky, Mammoth Cave National Park is a UNESCO World Heritage Site and an International Biosphere Reserve. It is home to the longest known cave in the world and features over 400 ...