Kentucky’s Mammoth Cave National Park features the longest known cave system, which stretches for 400 discovered miles (644 km) and another 600 miles (966 km) unexplored. In 1839, Dr. Croghan of Louisville, Kentucky, acquired Mammoth Cave for $10,000. With minimal treatment methods existing for tuberculosis in the 19th century, Croghan purchased Mammoth Cave as a […]
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