After the Second World War, few women have access to the very masculine profession of architecture, though there is no lack of work. Many European centres have been destroyed, while American cities struggle to cope with population explosions. The city needs to be rethought. Dreaming of a more human urban environment, four trailblazing women break into this male-dominated world and begin creating the cities of tomorrow. Blanche Lemco van Ginkel, Phyllis Lambert, Cornelia Hahn Oberlander and Denise Scott Brown might not be household names, but they worked with some of the greatest architects of our time – Mies van der Rohe, Le Corbusier, Louis Kahn and Robert Venturi – and have left their stamp on the cities of North American and Europe.