Kentucky is home to Mammoth Cave, which holds what impressive global title?
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Mammoth Cave National Park preserves the longest known cave system on Earth, with over 400 miles of surveyed passageways. It is more than twice as long as the second-longest cave system, located in Mexico. New passages are still being discovered by explorers today. Photo: Willis Thomas Lee, Wikimedia Commons, Public domain.
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Source: Wikipedia (CC BY-SA)
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