longest known cave system in the world · All Facts

longest known cave system in the world
Kentucky's Mammoth Cave is the longest known cave system in the world with over <hl>420 miles</hl> of explored passageways — and new sections are still being discovered.
SrcNational Park Service

Next evidence →YellowstoneWyoming's Yellowstone, established in 1872, was the world's first national park. The state has the smallest population of any US state — roughly 580,000 people — fewer than many individual US cities.

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YellowstoneWyoming's Yellowstone, established in 1872, was the world's first national park. The state has the smallest population of any US state — roughly 580,000 people — fewer than many individual US cities.
Independence HallPennsylvania's Independence Hall in Philadelphia is where both the Declaration of Independence (1776) and the US Constitution (1787) were debated and signed — making it the only building where both founding documents were created.
Great Smoky MountainsTennessee's Great Smoky Mountains National Park is the most visited national park in the US with over 12 million visitors annually. The "smoke" is actually natural fog created by moisture released by the park's dense vegetation.
DenaliAlaska's Denali (formerly Mount McKinley) stands at 20,310 feet — the highest peak in all of North America. Because it rises from a low base elevation, its vertical rise from base to summit is actually greater than Mount Everest's.

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