A well-publicized, world-class event can inspire fashion for years. At least that's the case with the 1893 World's Columbian Exposition in Chicago, which showcased cutting-edge classical buildings that architects around the country emulated in their own residential and commercial designs. The Neoclassical style remained popular through the 1950s in incarnations from one-story cottages to multilevel manses. Its identifying Ionic or Corinthian columned porches often extend the full height of the house. Also typical: symmetrical facades, elaborate, decorative designs above and around doorways, and roof-line balustrades (low parapet walls).