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Mammoth Cave National Park
Great Onyx Lantern Tour
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Did You Know?
Mammoth Cave is the world's longest known cave. In fact it is so long that if the second and third longest caves in the world were joined together, Mammoth Cave would still be the planet's longest cave and have nearly 100 miles left over!
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Last Updated: July 22, 2008 at 15:28 EST |