The Library of Congress has digitized over 11,000 slides by architectural critic and curator John Margolies (1940-2016). Photographed over a span of forty years (1969-2008), Margolies’ Roadside America work chronicled a period of American history defined by the automobile and the ease of travel it allowed. The Archive is one of the most comprehensive documentary studies of vernacular commercial structures along main streets, byways, and highways throughout the United States in the twentieth century.