Ultimate Marvel Universe: Battleworld

Located: Unknown, Presumably in Space Description: Though not the modern version of Battleworld (pretty hard to cram many different multiverses into one world), this version of Battleworld is home to no one, essentially. However, that doesn't mean that battles don't occur. When Doctor Doom wants to set himself up as a supreme ruler or Thanos has collected all of the Infinity Gems, the many heroes take the battle to Battleworld. No cosmic terror in sight? Try exploring the place. With the low population, it's also a good place to practice your abilities. Safety first and wear a spacesuit...unless your body has adapted itself in a way that allows for you to survive the vacuum of space. To which I say, kudos to you.