An illustrated digital archive of Chicago’s architectural evolution.

Documenting the engineering breakthroughs, structural steel innovations, and master builders who shaped the city’s landscape over more than a century.

1830s–1860s

Pioneer & Antebellum

From early swamplands and balloon framing to the Water Tower pumping station and Lake Michigan water tunnel.

1870s

Great Fire & Rebuilding

The catalytic 1871 conflagration, the blank canvas, revised building codes, and early Palmer House iterations.

1880s

Chicago School & Commercial Style

The birth of the skyscraper, iron skeletons, grillage pads, Tacoma Building curtain walls, and Dearborn Station.

1890s

Columbian Exposition & Steel Towers

The 1893 World’s Fair, white terra cotta, Reliance Building, Chicago Stock Exchange, and city annexations.

1900s–1920s

Modern Era & Expansion

20th-century developments, Carbide & Carbon, Medinah Temple, Union Station, and the Chicago River reversal.

Pioneers

Architects & Masters

Profiles and masterworks of Jenney, Burnham, Root, Sullivan, Adler, Holabird, Roche, and H.H. Richardson.

Infrastructure

Transit & Waterworks

Horse railways, cable cars, lake tunnels, water tower pumping stations, and central railroad depots.

Engineering

Materials & Skeleton Frames

Floating grillage foundations, caissons, Bessemer steel, Chicago windows, and glazed terra cotta cladding.

Hospitality

Grand Hotels & Landmarks

Evolution of high-density hospitality, including the Tremont House, Sherman House, and Palmer House 3 & 4.

Text Master

Source Documents & Monographs

Original historical monographs, transcripts, city landmark designation reports, and academic essays.

Image Bank

Architect & Essay Master Images

High-resolution historical chromolithographs, floor plans, structural diagrams, and vintage photography.