Mammoth Cave rumored to lead to an Inner Earth world
Located in central Kentucky and covering well over 52,000 acres, the Mammoth Cave was established as a national park in 1941, and as a World Heritage Site in 1981. With a staggering 400 miles (640 km) of surveyed passageways, Mammoth Cave is by far the world's longest known cave system, over twice as long as the second-longest cave system, Mexico's Sac Actun underwater cave. Archeologists are constantly making new discoveries and additional connections in this cave system, adding several miles to this figure each year.
The Echo River Tour, one of the cave's most famous attractions, took visitors on a boat ride along an underground river, but the tour was discontinued in the early 1990s. There are rumors of deep passageways not accessible to tourists.
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