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Illinois

State Register

Landmarks in Illinois

Landmarks in Illinois

Monks Mound, the largest earthwork in the Americas, at Cahokia.

Cahokia Mounds

Illinois

The exterior of the Lincoln Home in Springfield, Illinois.

Lincoln Home

Illinois

Robie House

Illinois

Historic row houses in the Pullman National Monument district in Chicago.

Pullman National Historical Park

Illinois

The exterior of Frank Lloyd Wright's Home and Studio in Oak Park, Illinois.

Frank Lloyd Wright Home and Studio

Illinois

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© 2026 Old USA. Historic images are used under public-domain or documented licenses; each image records its credit and source — see our sources page.