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Mammoth Cave National Park – Kentucky, USA
This cave is known for being the longest in the world, spanning over 528.3 kilometers. It attracts hordes of tourists all year round, who are eager to see its many attractions such as the Frozen Niagara, the Grand Avenue, and the Fat Man’s Misery. The National Park offers several tours daily, some of which can last up to a maximum of 6 hours.
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