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The Ellison Cave System Boasts Two Of The Deepest Freefall Pits In The United States
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A 100-year-old tragic cave accident led to this national park. Here's what happened.
Floyd Collins got trapped in a Kentucky cave 100 years ago this week, an incident that led to the creation of Mammoth Cave ...
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Carlsbad Caverns National Park
Carlsbad Caverns is home to some of the most spectacular examples of underground geologic features found anywhere in the United States ... limestone caves carved over the course of 250 million years.