Hint
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National Park
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Contains an active volcano
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Crater Lake | Death Valley | Haleakala | Hawaii Volcanoes | Katmai | Lake Clark | Lassen Volcanic | Mount Rainier | Wrangell-St Elias | Yellowstone
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Established primarily for man-made structures
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Gateway Arch | Mesa Verde
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Entirely on islands
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American Samoa | Channel Islands | Dry Tortugas | Haleakala | Hawaii Volcanoes | Isle Royale | Virgin Islands
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Has bison
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Badlands | Capitol Reef | Grand Canyon | Grand Teton | Great Sand Dunes | Theodore Roosevelt | Wind Cave | Yellowstone
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Borders a metro area with a population > 1 Million
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Biscayne | Cuyahoga Valley | Everglades | Gateway Arch | Indiana Dunes | Saguaro
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With glaciers but not in Alaska
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Glacier | Grand Teton | Great Basin | Kings Canyon | Mount Rainier | North Cascades | Olympic | Rocky Mountain | Sequoia | Yosemite
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On the Colorado Plateau
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Arches | Bryce Canyon | Canyonlands | Capitol Reef | Grand Canyon | Mesa Verde | Petrified Forest | Zion
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In the Appalachian Mountains
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Great Smoky Mountains | New River Gorge | Shenandoah
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In the Great Basin (as defined hydrologically)
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Bryce Canyon | Death Valley | Great Basin | Joshua Tree | Lassen Volcanic
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Touches an international border
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Big Bend | Glacier | Glacier Bay | Isle Royale | North Cascades | Voyageurs | Wrangell-St Elias
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On the Pacific Crest Trail
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Crater Lake | Kings Canyon | Lassen Volcanic | Mount Rainier | North Cascades | Sequoia | Yosemite
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Shares their exact name with a national forest
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Olympic | Sequoia
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Indented by fjords
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Acadia | Glacier Bay | Katmai | Kenai Fjords | Lake Clark | Wrangell-St Elias
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The name of their state/territory is in their name
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American Samoa | Hawaii Volcanoes | Indiana Dunes | Virgin Islands
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One of the 12 best climbing areas in the USA according to the American Mountain Guides Association
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Joshua Tree | New River Gorge | Yosemite
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Touches a state border
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Death Valley | Gateway Arch | Great Smoky Mountains | Guadalupe Mountains | Yellowstone
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