Subject
Roads
Islands
7
Bridges
6
Lakes & ponds
6
Mountains
6
Parks
5
Railroads
5
Rivers
5
Bays (bodies of water)
4
Churches
4
Towers
3
Castles & palaces
2
Dwellings
2
Harbors
2
Historic buildings
2
Railroad bridges
2
Villages
2
Architecture
1
Asylums
1
Cliffs
1
Courthouses
1
Electric railroads
1
Monuments & memorials
1
Round Towers
1