According to Hollywood movies, Las Vegas is either the greatest place on Earth or the worst place on Earth and everything that's wrong with America. I've never been to Vegas so I couldn't really say from first-hand experience what I think of Sin City, but I have seen several movies featuring the legendary town. So it's almost like I've been there. Kind of. Barely. Anyways, in honor of "The Hangover Part III," here are five of the most memorable films featuring the city that truly never sleeps.