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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 known cave system on Earth.
The 'Broadway' is a massive passageway within Mammoth Cave, known for its wide and spacious corridors.
The formation of Mammoth Cave began over 10 million years ago, shaped by the natural processes of limestone erosion.
The cave is home to several unique species, including the endangered Kentucky cave shrimp, which is blind and colorless.
During the War of 1812, Mammoth Cave was mined for saltpeter, a key ingredient in gunpowder.
The cave maintains a constant temperature of around 54°F (12°C) year-round, providing a cool escape in the summer.
Native Americans explored Mammoth Cave over 4,000 years ago, leaving behind artifacts and evidence of their presence.
Mammoth Cave became a popular tourist destination in the early 19th century, with guided tours starting as early as 1816.
In 1981, Mammoth Cave was designated a UNESCO World Heritage Site due to its extensive cave system and biodiversity.
