Region
Aden (Yemen)
1
Afghanistan
1
Alaska
6
Alaska-Siberia Air Route (Alaska and Russia)
1
Altus Air Force Base (Okla.)
1
Andes Region
1
Arctic regions
1
Arizona
9
Arlington
2
Asia
1
Atlantique Nord
1
Australia
2
Austria
1
Brazil
1
British Columbia
1
Buga Region (Valle del Cauca)
1
California
5
California, Northern
1
Canada
5
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
4
Civilization
1
Cleveland
2
Colombia
1
Colorado
1
Columbus Air Force Base (Miss.)
1
Coronado National Memorial
1
Coronado National Memorial (Ariz.)
1
Dallas
1
Denver
1
Dessau (Dessau)
2
Edwards Air Force Base (Calif.)
2
Egypt
2
England
1
Europe
5
European Union countries
2
Florida
2
Foreign countries
1
Fort Bowie National Historic Site
1
Fort Bowie National Historic Site (Ariz.)
1
France
1
Georgia
2
Germany
16
Grand Canyon National Park
2
Grand Canyon National Park (Ariz.)
3
more ...