With the advent of structural steel, skyscrapers like this one in progress in Chicago in 1891 became prominent features of the American urban landscape. This architect’s rendering of the Fair Building, a department store designed by William Le Baron Jenney, shows a modern skyscraper whose foundations supported the structural steel skeleton so that the walls could simply “hang” on the outside of the building, because they no longer had to support the structure. Newberry Library (Inland Architect, Nov. 1891).