United States. National Park Service

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1) Olympic National Park, Washington

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United States. National Park Service

2) Vicksburg: Vicksburg National Military Park, Louisiana/Mississippi

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United States. National Park Service

3) Timpanogos Cave National Monument, Utah

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United States. National Park Service

4) Hot Springs National Park, Arkansas

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United States. National Park Service

5) Blue Ridge Parkway, North Carolina/Virginia

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United States. National Park Service

6) Santa Monica Mountains National Recreation Area, California

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United States. National Park Service

7) Delaware Water Gap National Recreation Area, New Jersey/Pennsylvania

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United States. National Park Service

8) Fort Raleigh National Historic Site, North Carolina

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United States. National Park Service

9) Fort Larned National Historic Site, Kansas

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United States. National Park Service

10) Johnstown Flood National Memorial, Pennsylvania

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United States. National Park Service

11) Gulf Islands National Seashore, Florida / Mississippi

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United States. National Park Service

12) Grand Teton National Park, John D. Rockefeller, Jr. Memorial Parkway, Wyoming

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United States. National Park Service

13) Canyonlands National Park, Utah

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United States. National Park Service

14) Cape Lookout National Seashore, North Carolina

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United States. National Park Service

15) Cape Cod National Seashore, Massachusetts

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United States. National Park Service

16) Ocmulgee

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United States. National Park Service

17) St. Croix, 50th anniversary 1968-2018: St. Croix National Scenic Riverway, Minnesota and Wisconsin

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United States. National Park Service

18) North Cascades National Park, Ross Lake National Recreation Area, Lake Chelan National Recreation Area, Washington

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United States. National Park Service

19) Pictured Rocks National Lakeshore, Michigan

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United States. National Park Service

20) Prince William Forest Park, Virginia

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United States. National Park Service