The City Beautiful Movement sought to beautify American cities in the late 19th/early 20th century through monumental architecture and planning inspired by European styles. Reformers believed beautifying cities could inspire civic duty and morality among residents. Daniel Burnham was a leading architect who helped plan the 1893 World's Fair and 1901 plan for Washington D.C., spreading Beaux-Arts styles. He designed skyscrapers like the Flatiron Building and co-authored Chicago's 1909 plan, establishing himself as a pioneer of American city planning before dying in 1912.