Region
Europe
7
United States
6
Cambridge
4
France
4
Germany
4
Massachusetts
4
Soviet Union
3
Chile
2
Great Britain
2
Istanbul
2
Italy
2
Latin America
2
Mexico
2
Netherlands
2
New York
2
New York (State)
2
Spain
2
Turkey
2
21st century
1
Argentina
1
Boston
1
Brazil
1
Brésil
1
Chichén Itzá Site (Mexico)
1
Chili
1
Czechoslovakia
1
Dakar
1
Dakar (Senegal)
1
Dunhuang Caves (China)
1
Europa (geografie)
1
Europe, Northern
1
Frankrijk
1
Georgia (Republic)
1
Greenland
1
Iceland
1
India
1
Islamic countries
1
Istanbul (Turkey)
1
Japan
1
Karkūk (Iraq)
1
Lille Metropolitan Area
1
Longmen Caves (China)
1
Louisiana
1
Münster (Westf)
1
Naushon Island (Mass.)
1
New Jersey
1
New Orleans
1
New Orleans (La.)
1
New York (N.Y.)
1
Northern Europe
1
more ...