What was the proposed population of Superstudio’s Continuous Monument? What would the density of Rem Koolhaas’ Exodus plan for London have been had it ever been realized? How would they compare in scale to Kenzo Tange’s Tokyo Bay project, or to Corbusier’s Ville Radieuse? Which of the three would have contained more green areas? 49 Cities sets out to crunch the numbers of several centuries of unrealized urbanism, all the way from the Roman city to the great utopian projects of the 20th century. Through plans, sections, diagrams, charts and scale drawings, 49 cities are observed statistically and presented in an unprecedented comparative study, the result of a research project conducted over several years. Despite the fact that they never actually existed, this history of utopian urbanism provides a remarkable insight into our understanding of the contemporary metropolis.