"Everyone is free here. . . . The cities are open. They are open to the world and to the future. That is what gives them all an air of adventure; and . . . a kind of touching beauty." So wrote the French philosopher Jean-Paul Sartre on a 1945 trip to the United States during which he crossed the country and dove deep into the soul of the American city. In this new volume, Sartre's reflections on the distinctly American quality of cities in the...