Today, seven people out of ten live in a city. What realities does this acceleration in urbanization conceal? Gargantuan megalopolises take shape, rural worlds vanish, the built world sprawls horizontally and stacks vertically all at once, new forms of segregation and inequality arise, etc. A primary symptom of our entrance into the Anthropocene era, the spread of cities warms the globe, destroys biodiversity, and makes us highly vulnerable to climate change. To explore these urban worlds, Éric Verdeil and the Cartography Workshop at Paris Institute of Political Studies compared classical sources with the possibilities offered by digital technologies, increased the number of scales at which items are examined, and freed themselves from the standard territorial spatialities.