Lotta great picks here, keep em coming!
Some of mine:
Rapture (Bioshock) for its unforgettable atmosphere, visual direction, and backstory

Tallon IV (Metroid Prime) for how immersive it was, really making you feel like you were alone on a dying planet
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Bionis and Mechonis (Xenoblade Chronicles) for how imaginative and unique and epic it was as a setting

Night City + Dogtown (Cyberpunk 2077) for how rich and fleshed out its world was in everything from its lore to design








