Acadia, Maine
American Samoa, American Samoa
Arches, Utah
Badlands, South Dakota—check
Big Bend, Texas—check
Biscayne, Florida
Black Canyon of the Gunnison, Colorado
Bryce Canyon, Utah
Canyonlands, Utah
Capitol Reef, Utah
Carlsbad Caverns, New Mexico
Channel Islands, California
Congaree, South Carolina
Crater Lake, Oregon—check
Cuyahoga Valley, Ohio
Death Valley, California, Nevada—check
Denali, Alaska
Dry Tortugas, Florida keys
Everglades, Florida
Gates of the Arctic, Alaska
Glacier, Montana
Glacier Bay, Alaska
Grand Canyon, Arizona—check
Grand Teton, Wyoming—check
Great Basin, Nevada
Great Sand Dunes, Colorado
Great Smoky Mountains, Tennessee—check
Guadalupe Mountains, Texas
Haleakala, Hawaii
Hawaii Volcanoes, Hawaii
Hot Springs, Arkansas
Isle Royale, Michigan
Joshua Tree, California—check
Katmai, Alaska
Kenai Fjords, Alaska
Kings Canyon, California—check
Kobuk Valley, Alaska
Lake Clark, Alaska
Lassen Volcanic, California
Mammoth Cave, Kentucky
Mesa Verde, Colorado
Mount Rainier, Washington
North Cascades, Washington
Olympic, Washington—check
Petrified Forest, Arizona—check
Redwood, California—check
Rocky Mountains, Colorado—check
Saguaro, Arizona
Sequoia, California—check
Shenandoah, Virginia
Theodore Roosevelt, North Dakota
Virgin Islands, US Virgin Islands
Voyageurs, Minnesota
Wind Cave, South Dakota
Wrangell-St. Elias, Alaska
Yellowstone, Wyoming, Montana, Idaho
Yosemite, California—check
Zion, Utah 12 months ago