They call it Sin City for a reason—a city run on the ideology of pleasure-seeking consumerism is never going to please God. For as long as Vegas has stood for glitz, glamor and glory at the poker table, it's also attracted muggers, mobsters and mescaline addicts. By representing the American Dream in its seediest form, the city serves as a sort of dark counterpart to Hollywood. Little surprise, then, that the movies return to it time and again. Read on as we delve into the sins of Las Vegas's cinema.