Subject
Historic buildings
Castles & palaces
1,562
Cathedrals
989
Dwellings
235
Churches
134
Lakes & ponds
58
Antiquities
57
Monuments & memorials
31
Bridges
30
Universities & colleges
27
Protestant churches
22
Libraries
21
Rivers
18
Towers
18
Architecture
14
Islands
13
Causeways
11
Streets
11
Ruins
9
Round Towers
8
Tombs & sepulchral monuments
8
Abbeys
7
Barracks
7
Galleries & museums
7
Piers & wharves
7
Ships
7
Cliffs
6
Harbors
6
Plazas
6
Bays (bodies of water)
5
Boats
5
Capes (Coasts)
5
Convents
5
Crosses
5
Valleys
5
Irish
4
Mills
4
Cemeteries
3
City & town halls
3
Parks
3
Gardens
2
Mountains
2
Roads
2
Beaches
1
Caves
1
Courthouses
1
Golf
1
Schools
1
Stables
1
Steamboats
1
more ...