Ankh-Morpork is the largest city on the Discworld, famed for the solidity of its river and its smell. It is ruled by a Patrician, currently Lord Vetinari. It is a vibrant, cosmopolitan place, filled with colour and violence. It is home to some of the Disc's most fangirled characters; namely Captain Carrot Ironfoundersson, Sgt. Delphine Angua von Uberwald, and Commander Samuel Vimes, the Duke of Ankh. In their haste to pervert and possess these and other canon characters, badficcers often forget about the less savoury aspects of life in the big city, making choosing assassination methods ridiculously difficult through an excess of choice. The assassin lucky enough to be working in Ankh-Morpork will also note that as bodies lying in the streets, particularly outside pubs, are hardly uncommon there, disposal of your Sue is far from difficult.
For those of us not able to jump between continua on whim, there's now an iPad app that lets people explore the city.