Best Video Game Fantasy Worlds

I feel like my whole life is actually in Tamriel. Plus, (nerd activated) Tamriel is not a world. It's a continent on the planet of Nirn that has various other continents. The space it floats in is called Mundus. Mundus is surrounded by Oblivion, which in turn is surrounded by Aetherius. All in all, you can say that the "world" of TES is the planet Nirn. (nerd off)... what?