Hell

Hell is an important part of the Doom universe, being the source of all the monsters in the game. In the original and Ultimate Doom, all of episode 3, Inferno, takes place in Hell, where it is depicted as predominately brimstone-covered with a fiery sky, complete with a demonic cathederal and pools of blood. Doom II's Hell levels are closer to subverted human buildings, with the exception of MAP28: The Spirit World and the last level, Icon of Sin.