Region
United States
225
Canada
7
Mexico
7
Guatemala
4
Brazil
3
China
3
Mali
3
Russia (Federation)
3
Arkansas
2
Bandiagara Caves (Mali)
2
Chile
2
Ecuador
2
Great Britain
2
Greece
2
Ireland
2
Japan
2
Missouri
2
New York (State)
2
Niger River Valley
2
Outer space
2
Paraguay
2
Santa Fe National Historic Trail
2
Ukraine
2
Algeria
1
Azerbaijan
1
Bahrain
1
Belize
1
Bolivia
1
Buffalo
1
California
1
Cambodia
1
Caribbean Area
1
Costa Rica
1
Detroit Region
1
Dominican Republic
1
European Economic Community countries
1
Finland
1
Gabon
1
Georgia (Republic)
1
Hong Kong
1
India
1
Indonesia
1
Israel
1
Jordan
1
Kenya
1
Kuwait
1
Laos
1
Libya
1
Malaysia
1
Maldives
1
more ...