USA/KY: Mammoth Caves NP – Cleaveland Ave Tour

Mammoth Cave National Park protects the largest cave in the world – more than 390 miles (630 km) of passageway have been explored underground. A ranger-guided tour take you on only a small portion of the cave – long narrow tunnels underground with unusual formations along the way. On the Cleaveland Avenue tour you get to see a lot of gypsum-encrusted underground passageways.
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