ArchitectThomas Ustick WalterAmerican architect (1804–1887), 1804–1887Photograph of one of their buildings · United_States_Capitol_-_west_front.jpg: Architect of the Capitol derivative work: O.J. · Public domain · Wikimedia Commons2 buildingsUnited StatesFurther readingWikipedia article↗BuildingsTreasury BuildingWashington, D.C., United StatesUnited States CapitolWashington, D.C., United States