Subject
- Roads and Highways20
- Events19
- Exhibitions19
- Philadelphia Centennial Exposition, 187619
- Waterfalls19
- Bridges18
- Exhibition Buildings18
- National Parks18
- Railway Buildings and Structures17
- Religious Buildings15
- Capitols (statehouses)13
- Natural Phenomena12
- Plants12
- Seasons12
- Winter12
- Lakes11
- Monuments and Memorials11
- Shops11
- Capitol (Washington)10
- Trees10