Subject
Harbors
Ships
18
Boats
15
Bridges
13
Dwellings
11
Piers & wharves
9
Steamboats
7
Historic buildings
4
Rivers
4
Bays (bodies of water)
3
Castles & palaces
3
Churches
3
Islands
3
Ruins
3
Towers
3
Beaches
2
Monuments & memorials
2
Plazas
2
Railroad stations
2
Railroads
2
Roads
2
Streets
2
Villages
2
Cathedrals
1
Cliffs
1
Electric railroads
1
Forts & fortifications
1
Lakes & ponds
1
Lifeboats
1
Meadows
1
Parks
1
Wetlands
1