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Mammoth Cave NP, Kentucky
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Mammoth Cave boasts over 420 miles of surveyed passageways, making it the longest cave system on Earth.
The Historic Entrance of Mammoth Cave maintains a constant temperature of around 54°F (12°C) year-round, providing a natural cooling effect.
Native Americans explored Mammoth Cave over 4,000 years ago, leaving behind artifacts and evidence of their presence.
The cave is home to several unique species, including the eyeless cave fish and cave shrimp, adapted to the dark environment.
During the War of 1812, Mammoth Cave was mined for saltpeter, a key ingredient in gunpowder production.
The 'Bottomless Pit' is a famous feature within Mammoth Cave, once thought to be infinitely deep until it was later measured at 105 feet.
In the 1840s, a failed experiment attempted to use the cave's stable climate to treat tuberculosis patients.
Mammoth Cave has been a tourist attraction since the early 1800s, making it one of the oldest tourist destinations in the United States.
