Region
Alaska
4
Alaska-Siberia Air Route (Alaska and Russia)
1
Arctic regions
1
Arizona
9
Arlington
2
Australia
1
Brazil
1
California
4
California, Northern
1
Canada
3
Cape Hatteras National Seashore
1
Cape Hatteras National Seashore (N.C.)
1
Casa Grande Ruins National Monument
1
Casa Grande Ruins National Monument (Ariz.)
1
Charleston
1
Chicago
2
China
2
Cleveland
2
Colorado
1
Coronado National Memorial
1
Coronado National Memorial (Ariz.)
1
Denver
1
Edwards Air Force Base (Calif.)
2
Europe
3
European Union countries
2
Florida
1
Foreign countries
1
Fort Bowie National Historic Site
1
Fort Bowie National Historic Site (Ariz.)
1
France
1
Germany
3
Grand Canyon National Park
2
Grand Canyon National Park (Ariz.)
3
Great Britain
7
Great Plains
1
Hawaii
2
Hudson River
1
Hudson River (N.Y. and N.J.)
2
Illinois
2
Imperial Beach
1
India
1
Isle Royale National Park
1
Isle Royale National Park (Mich.)
1
Italy
1
Japan
3
Kings Mountain National Military Park
1
Kings Mountain National Military Park (S.C.)
1
Ladd Air Force Base (Alaska)
1
Lake and Peninsula Borough
2
Lake and Peninsula Borough (Alaska)
2
more ...