Region
United States
4
Pennsylvania
3
Massachusetts
2
Antietam National Battlefield (Md.)
1
Boston
1
Boston National Historical Park (Boston, Mass.)
1
California
1
Cape Lookout National Seashore (N.C.)
1
Clara Barton National Historic Site (Md.)
1
Crater Lake National Park
1
Crater Lake National Park (Or.)
1
Gettysburg
1
Gettysburg National Military Park (Pa.)
1
Hawaii
1
Hawaii Volcanoes National Park
1
Inyo County
1
Johnstown
1
Kilauea Volcano (Hawaii)
1
Manzanar National Historic Site (Calif.)
1
Missouri
1
North Carolina
1
Oregon
1
Owens Valley
1
Rim Drive (Or.)
1
Saint Louis
1
Saugus
1
Saugus (Mass.)
1
Saugus Iron Works National Historic Site (Saugus, Mass.)
1
Ulysses S. Grant National Historic Site (Mo.)
1