Minecraft wiki entry for Building_a_metropolis, associated text: Nether Access Build a nether portal and let people get to the Nether. Even better, if it spawns you right next to a nether fortress, then you can make a tour and block off dead ends. Or just make a netherrack mine. Build a nether-style building around the portal so people can easily see where it is. Cannot be made in The End or Nether cities, consider "Overworld Access" there.