I
- ice cream parlors (4)
- ice industry (5)
- ice skating rinks (1)
- icebreakers (1)
- icehouses (28)
- immigrants (72)
- incinerators (6)
- inclined planes (9)
- Indian reservations (5)
- Indiana limestone (2)
- Indians of North America (210)
- indigenous peoples (7)
- industrial facilities (125)
- industrial towns (1)
- industrial works (1)
- industry (1184)
- infirmaries (10)
- ingots (1)
- inside end chimneys (13)
- inspection (5)
- institutional care (1)
- insulation (1)
- insurance (3)
- intakes (9)
- integral porches (1)
- intelligence (1)
- interlocking towers (1)
- international relations (2)
- International Style architectural elements (10)
- interpretation (2)
- Ionic order (32)
- iron (metal) (1)
- iron balconies (9)
- iron columns (2)
- iron fences (19)
- iron industry (78)
- iron railings (1)
- iron truss bridges (34)
- ironworks (20)
- ironwork (59)
- irrigation canals (74)
- irrigation (81)
- islands (248)
- Italianate architectural elements (56)