As awesome as The World That Never Was is, The Keyblade Graveyard takes the cake for me. Bad things may have happened there, but it's the home of the Lingering Sentiment... and that holds value for me.
I know I'm probably not the first to point this out, but I have a hunch that Riku moving up parallels "Darkness becomes light" and Sora falling parallels "Light will drop into darkness."
I love symbolism!
Riku looks awesome here... it almost makes up for them chopping off his epic hair...