Mammoth Cave National Park
Mammoth Cave National Park, located in the state of Kentucky, has the world's largest network of natural caves and underground passageways, which are characteristic examples of limestone formations. The park and its underground network of more than 560 surveyed km of passageways are home to a varied flora and fauna, including a number of endangered species.
http://whc.unesco.org/en/list/150
Mammoth Cave National Park holds the longest cave system in the world. Its known passages extend to 365 miles. The limestone caves were carved by the Green River and its tributaries.
The caves were formed over 100 million years ago and the geological process is still continuing. Most types of cave formation can be found here. Some dripstone is present, notably at a site called "Frozen Niagara". Fossils are also distributed throughout the rocks. The endangered Kentucky cave shrimp, a sightless albino shrimp, lives in the caves.
The park derives its name "Mammoth" from its gigantic size, not because mammoths ever lived there.
http://www.worldheritagesite.org/sites/mammothcave.html
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