Region
Austria
1
California
3
Cambridge
1
Colorado
1
England
2
France
2
Germany
1
Great Britain
1
Kansas
2
Monument Valley (Ariz. and Utah)
1
Navajo Nation, Arizona, New Mexico & Utah
1
Nevada
3
New Zealand
1
Poland
1
San Juan Mountains (Colo. and N.M.)
1
United States
21
Venus (Planet)
1
Vienna
1
Yellowstone National Park
1