In 1981, researchers mapped Mammoth Cave’s underground drainage; later dye-tracing studies showed about 60% of its aquifer recharge area lies beyond park bou…

Rain that falls miles beyond the national park can sink into the ground through sinkholes, travel through hidden underground ...
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This national park has the longest-known cave system in the world—with over 400 miles of passages and a frozen waterfall

Along with underground adventures, Mammoth Cave National Park in Kentucky offers great hiking and kayaking, too. Located in Kentucky, Mammoth Cave National Park is home to the world's longest-known ...
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Explore Mammoth Cave, the largest known cave system in the world

More than two centuries after Europeans settlers arrived in Kentucky, explorers are still discovering unknown caves and passageways in Western Kentucky. Mammoth Cave National Park is the longest known ...