Monocentricity and over population within the exiting boundaries are the key problems of modern megalopolises. Megaprojects are aimed at providing a solution to these problems, stimulate economic development, give impetus to urban redesign and refine the structure of the city. These projects constitute invaluable experience in urban design that needs to be carefully examined. A dialogue between «Grand Paris» and «Big Moscow» is especially critical. Despite differences in management structure, territorial organisation and pace of development, these projects attempt to solve similar problems, as they plan to increase the amount of habitable spaces, expand transport networks and improve the city’s environment.