What is a national park? -- US national parks -- Biscayne -- Everglades, Dry Tortugas -- Virgin Islands, Congaree -- Great Smoky Mountains -- Mammoth Cave, Shenandoah, New River Gorge -- Acadia -- Cuyahoga Valley, Indiana Dunes -- Isle Royale, Voyageurs -- Hot Springs, Gateway Arch, Wind Cave, Badlands -- Theodore Roosevelt, Big Bend -- Carlsbad Caverns, White Sands, Guadalupe Mountains -- Great Sand Dunes, Rocky Mountain, Black Canyon of the Gunnison -- Yellowstone -- Grand Teton, Glacier -- Mesa Verde, Capital Reef, Canyonlands, Arches -- Zion, Bryce Canyon -- Grand Canyon -- Petrified Forest, Seguaro -- Joshua Tree, Channel Islands, Pinnacles -- Death Valley -- Sequoia and Kings Canyon, Great Basin -- Yosemite -- Lassen Volcanic, Crater Lake, Redwood -- Mount Rainier, North Cascades, Olympic -- Glacier Bay, Wrangell-St. Elias, Kenai Fjords, Katmai -- Denali -- Lake Clark, Kobuk Valley, Gates of the Arctic -- American Samoa, Haleakala -- Hawai'i Volcanes.
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