Courthouse #3
ornate wrought iron decoration on a windowHow well did you guess? Click to go to the courthouse's web page to check your answer!

The wrought iron work is one example of Art Deco detail. Several Iowa courthouses were built with PWA Moderne style, which featured Art Deco features. Popular in the 1920-30's, Art Deco symbolized modern, efficient structure with stylish geometric motifs.
Wikipedia: Art Deco
Michael's Architecture: Art Deco
PWA/WPA Moderne