The home of the DC Comics superhero, Superman. Also a real place (I would know, I live there) located in Illinois. Each year Metropolis hosts the Annual Superman Celebration, in which festivities consisting of Carnival Rides, Celebrity Appearances, and contests are held.
Fun fact: Metropolis's grocery store, Big John, has a statue that is bigger than the Superman Statue.
Metropolis is also home to the Hollywood Americana Museum, The Pony Strip Club, and Harrah's Casino.
Nerd: Hey Dad, can we please visit Metropolis on vacation this year?
Dad: Why would you want to go there, son? Metropolis is lame.
Nerd (now crying): How would you know?
Dad: I've been there.