Subject
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Caves
69
Architecture
67
Ruins
67
Steamboats
67
Electric railroads
65
Hospitals
58
Libraries
58
Galleries & museums
57
Asylums
52
Estates
52
Lighthouses
49
Houses
48
Irish
48
Universities and colleges
46
Forts & fortifications
43
Post offices
41
Shrines
39
Protestant churches
36
Military camps
35
Street-railroads
34
Tombs & sepulchral monuments
34
Evictions
32
Country life
21
Canals
20
Yachts
19
Stores & shops
17
Railroad bridges
14
Birthplaces
13
Fairs
12
Prisons
12
Statues
12
Indigenous peoples
11
Moats
11
Hills
10
Interiors
10
Rural women
10
Carts & wagons
9
Meadows
8
Dairying
7
Factories
7
Fishing
7
Passes (Landforms)
7
Tunnels
7
Round towers
6
Wetlands
6
Castles
5
Musicians
5
Banks
4
Boat clubs
4
Carriages & coaches
4
more ...