I have a question, and it'll probably sound REALLY stupid to Minecraft players, but I know next to nothing about the game, so please don't judge. But...I was wondering... all these awesome cities/castles/naturescapes/etcetera, are they hand built by one person, are they made by collaborative teams of people, or are they somehow automatically created by the game?
Depends! The more impressive builds are usually done by teams, but some can be built by one person! Depends how much time they have haha.
Some of them are auto generated, I know that someone generated a minecraft map which was an exact copy of the world from WoW!