Ankh-Morpork

 is the city where the BBC America series The Watch is set, based off Terry Pratchett's Discworld novels. The city is walled off, and is in general corrupt and polluted. Crime has been legalized in the town, leaving its citizens in despair. In theory, the town is protected by a group known as the City Watch, but the group is so named because theoretically that's all they can do - "watch."