There's just something about the Floating Continent that makes it so much better. Maybe because it's a whole continent that floats, and not just some puny castle.
Floating Castle [FF]
Whirlwind [FFII]
Elder Tree [FFIII]
Tower of Zot [FFIV]
Ronkan Ruins [FFV]
Floating Continent [FFVI]
Lunatic Pandora [FFVIII]
Chocobo Air Garden [FFIX]
There's just something about the Floating Continent that makes it so much better. Maybe because it's a whole continent that floats, and not just some puny castle.