We will show that creating a city on Mars is possible and makes sense today. We will assume that the basic technologies have already been created and will demonstrate how they can be used to build a city and human community on Mars. It is shown that under the conditions of jet traffic restrictions, an effective Earth-Mars transport and logistics infrastructure can be created. A large body of water ice is the basis for creating a safe habitat on Mars. Based on the principle of a diving bell, water will act as a regulator of the atmosphere of an underground metropolitan city with surface pavilions-stations. After the restoration of the magnetic field and atmosphere of Mars, Metro City will continue to develop on the surface from the pavilions of metro stations. A porto franco of the Earth will be created on Mars for cooperation with extraterrestrial civilizations, the existence of which seems obvious in the logic of the development of the Universe proposed by the Big Bang theory.