Myst, because it is all of the worlds.
ALL OF THEM.
Seriously. I think it subscribes to multi-verse/infinite universe theories, which means that, if it's physically possible, it exists in the Myst world.
The stuff that we're actually shown is pretty mind-blowing, too. The first game alone gave us a forest growing out of a massive lake strung with treehouses, a ship that suffered a materialization accident with a rock and a bizarre caldera in the middle of the ocean with assorted signs of civilization scattered over it, and by the time they got to game four, the level designs just got ludicrously good.