Travel + Leisure on MSN
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.
The air is cool and damp. The light shining from behind is low and tinted, while a park ranger's hand hovers over a button. Then, a switch clicks. Light floods a chasm in the stone, a chamber called ...
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