Call of Duty Zombies maps have offered no shortage of interesting settings. While the Aether storyline started things off in a simple WW2 bunker before thrusting players into an asylum, swamp, and factory, bolder locations started to become the norm. The Nazi-controlled theater from the original Black Ops was quickly outdone in this regard by the Pentagon, the mythical Shangri-La, and the moon. Things only got crazier from there, as players fought the undead in an underground old west town, a medieval castle, and a version of Stalingrad overrun by dragons. If Treyarch wants to return to more over-the-top maps, then a setting inspired by Steelrising could work quite well.