Region
America
1
American Samoa
1
Antarctica
1
Arizona
2
Art
1
Asia
2
Australia
5
California
2
Canada
7
Cape Lookout National Seashore (N.C.)
2
Caribbean Area
1
Central America
1
Chicago
1
Colombia
1
Cullowhee
1
Egypt
2
Estados Unidos
1
Europe
3
Fiji
1
Finland
1
Florida
1
Fort Larned National Historic Site (Larned, Kan.)
1
France
2
Gettysburg National Military Park (Pa.)
1
Grande-Bretagne
1
Great Astrolabe Reef
1
Great Astrolabe Reef (Fiji)
1
Great Britain
207
Greece
2
Großbritannien
1
Guam
1
Illinois
1
India
3
Isle of Dogs (London, England)
1
Japan
1
Jimmy Carter National Historic Site (Plains, Ga.)
1
Kansas
1
Kenya
3
Laredo
1
Larned
1
Latin America
3
Louisiana
1
Manitoba
5
Mars (Planet)
1
Maryland, Southern
1
Mexico
3
Montezuma Castle National Monument
1
Montezuma Castle National Monument (Ariz.)
1
Moon
1
Morocco
1
more ...