The IFHTP congresses held between the wars were one of the most important arenas of debate on the construction of the modern city. It was perhaps the first time in history that such a large number of representatives of various cultural spheres had come together from different countries to find concrete solutions to the problems that characterise the city and territory, to present the results of experiences in their different contexts and to define common strategies. This multidisciplinary and international arena is a precious source for studies of modern town planning.