The document summarizes the Congrès International d'Architecture Moderne (CIAM), an influential organization of modernist architects that held regular meetings between 1928 and 1959 to discuss urban planning issues. It provides images from CIAM meetings and publications that illustrate key concepts in modernist urban planning from the 1920s-1950s such as superblocks, towers in a park, and the separation of vehicular and pedestrian traffic. The document also features works from notable modernist architects like Le Corbusier, Walter Gropius, and Team X who were involved with CIAM and helped develop the urban renewal ideas and "Radiant City" plans that were debated at their conferences.