Second Edition featuring a new interview with Michael Webb (Archigram) and an essay by Sam Jacob (FAT). How many inhabitants would Buckminster Fullers Tetrahedron City house? What would the density of Rem Koolhaas Exodus plan for London, or Superstudios Continuous Monument, have been had they ever been realized? How would they compare in scale to Kenzo Tanges Tokyo Bay project, or to Corbusiers Ville Radieuse? Which of them would have comprised more green areas? 49 Cities sets out to crunch the numbers of several centuries of unrealized urbanism, all the way from the ideal Roman city to the great utopian projects of the 20th century. Through plans, sections, 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 these cities never actually existed in their intended form, this overview of utopian urbanism provides a remarkable insight into our understanding of the contemporary metropolis.