Region
United States
2,456
Europe
178
Colorado
138
China
97
Russia (Federation)
83
Iraq
76
Syria
69
Afghanistan
62
Great Britain
47
Middle East
43
California
40
Mexico
33
Washington (State)
30
Bosnia and Herzegovina
28
European Union countries
28
Pakistan
28
Europe, Eastern
27
New Mexico
26
Asia
25
New York (State)
25
Mexican-American Border Region
23
Washington (D.C.)
23
Developing countries
22
Libya
22
Massachusetts
22
Illinois
21
Pennsylvania
21
Arizona
20
Iran
20
England
19
Latin America
18
Africa
17
Taiwan
17
Balkan Peninsula
15
Canada
15
Japan
15
Oregon
15
Soviet Union
15
Yemen (Republic)
15
Maryland
14
Pacific Area
14
Chicago
13
France
13
Germany
13
North America
13
New Jersey
12
Organ Pipe Cactus National Monument
12
Baltic States
11
Florida
11
Minnesota
11
more ...