Location from Divergent by Veronica Roth
A post-apocalyptic walled city divided into five faction territories — the last experiment in whether humanity can be saved by forcing people to choose a single virtue and live by it.
Chicago doesn't feel like a city — it feels like a terrarium. The fence surrounds it completely. The factions each control their sectors with invisible but absolute borders. You can cross from Abnegation's quiet grey streets to the noise and neon of Dauntless in ten minutes, but socially the distance is infinite. The city runs on faction interdependence that's designed to look like cooperation: Amity grows the food, Erudite develops the technology, Dauntless provides security, Abnegation runs the government, Candor handles the law. It works until it doesn't. And when it doesn't, everyone discovers that a system built on the idea that humans can be sorted into five boxes was always going to crack along those lines. The truth — known only to a few — is that Chicago is a controlled experiment. The Bureau of Genetic Welfare seeded it, fenced it, and has been watching it for generations. The factions, the Choosing Ceremony, the aptitude tests — all of it was designed to produce Divergent individuals as proof that genetic damage can be repaired. The people living here don't know they're lab rats.
The ruins of old Chicago, partially rebuilt and repurposed by the faction system. Crumbling skyscrapers stand alongside functional buildings repainted in faction colors. The streets are mostly empty — people stay in their faction's territory. The skyline is dominated by the Hub's glass-and-steel tower and the Hancock building. Marshland presses against the fence on all sides. Lake Michigan is visible but unreachable. Everything feels contained, watched, walled.
Also known as: The City, The Chicago Experiment