Well, I feel rather inadequate about my own rather meager creations after having watched this video
featuring the Studio Ghibli world someone made. They recreated the town and bathhouse (inside and out) from "Spirited Away", the castle from "Castle in the Sky", the castle from "Howl's Moving Castle", what I think is the town from "Kiki's Delivery Service", the massive forests from "Nausica of the Valley of the Wind", the airplanes from "Porco Rosso", and I think I might have seen something in there from "The Cat Returns" as well. If you like the video, they've actually provided the map free to download for exploration. I'm going to have to wonder around there for a bit.