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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

Here’s how to plan a trip to Mammoth Cave National Park.
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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 ...