Region
Europe
12
United States
12
North America
3
Asia
2
Colorado
2
Middle East
2
Africa
1
Africa South of the Sahara
1
Africa, North
1
America
1
Americas
1
Australia
1
Canada
1
China
1
Fort Union Trading Post National Historic Site (N.D. and Mont.)
1
Great Plains
1
Mesa Verde National Park
1
Rome
1
Southern States
1
Spitalfields (London, England)
1
Tibet Region
1
Tigris River Valley
1
Turkey
1
Zimbabwe
1