This short documentary is part of a series hosted by American historian, sociologist, philosopher of technology, and literary critic Lewis Mumford, who was particularly noted for his study of cities and urban architecture. This episode presents an outline of the opposed natures—creative and destructive—of the city throughout history. In this film, the focus is on the elements that created the first cities about 5000 years ago, and the forces that now threaten our "most precious collective invention."