The entrance to Mammoth Cave, Mammoth Cave National Park
Mammoth Cave is the world's longest-known cave system, with more than 400 miles (643 km) explored.
NPS / Dale Pate
- By Rebecca Latson - July 14th, 2019 10:12am
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Mammoth Cave is the world's longest-known cave system, with more than 400 miles (643 km) explored.
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