It's just SUCH a pretty world, even in KH1, it was so glorious. The water walls, bubble travel (LMAO) the platforms, the puzzle thing with the books in the library, the room with all the princesses sleeping and just the whole castle in the first game was so fun to move around, so easy to get yourself lost and just so pretty.
Then KH2 came around and it just looked even better. Ansem's Laboratory, the Crystal Fissure leading into the Great Maw @ the Battle of the 1000 Heartless WAS EVERYTHING. The Cavern of Remembrance and The Garden of Assemblage were so PRETTY and the music in the garden of assemblage was so pretty.
Even in BBS it was such a pretty place, the colours were so beautiful. Likeeeee the fountain court WAS EVERYTHING.
Overall Hollow Bastion / Radiant Garden is the prettiest and my favourite map during the series. I do love Traverse Town and I hope it comes back, but Radiant Garden is everything...