Since the dawn of time, the concept of “city” overlaps some of the most advanced and courageous visions of how the world should be built. Today, for the first time in the history of mankind, more than half of the world’s population resides in urban settings. And while today’s metropolises continue to produce innovations and new cultural trends, they are also at the root of pollution, global warming, and the proliferation of social inequalities. Although much of the world's wealth originates in urban economies, a new development model is necessary to ensure the good of the people and the planet. What will the urban future look like after the Covid-19? Do we still need bold and unconventional visions? Can the major projects of "new cities" represent realistic and replicable paradigms? What conceptualization of “city” do these projects inspire? And which are the main challenges?