Why did architects of the 20th century strive not just to build buildings, but to create new worlds? In this lecture, you will learn fascinating details about megaprojects that were supposed to change the course of history: from bold dreams of reconstructing Paris to the birth of Brasília. Architect and guide Daniil Vedernikov will talk about projects that aimed to change not only the appearance of cities but also the very essence of humanity. The focus of the lecture will be on the largest urban planning concepts of Moscow, Paris, Berlin, and Brasília. You will learn about the Voisin plan, which could have radically transformed Paris by erasing historical buildings for the sake of functionality. You will hear about how the National Socialists dreamed of making Berlin a new world capital, and about large-scale reconstruction projects in Moscow in the 1930s to 1950s that reflected the ideological power and ambitions of the USSR. Special attention will be given to Brasília-a city built from scratch according to the principles of modernism. It became a symbol of faith in the possibility of creating an ideal society through rational design. Why did such utopias arise? What connected them, and why were many of them never realized? We know what to see in St. Petersburg.