Cities are often conceived as everlasting, but ruins remind us that they and the civilizations that built them also perish. The city is a social and historical product built by generations of people to last over time, integrate and relate to those who are different, facilitate life and encourage mixing, confluence and social encounter. In the 21st century, most of humanity lives in “cities.” However, currently the city is confronted with a series of processes that erode the attributes that define it as such. Urban expansion in increasingly distant peripheries, neoliberal globalization, the financialized real estate market, agoraphobic security policies and the virtualization of social contacts divide, disperse, fragment, privatize, decentralize, isolate and separate social and urban fabrics.