The museum is in Mitaka, about 20 minutes from Shinjuku. Mitaka is a really nice town - not like the hustling, bustling mess of Tokyo. For example, there's a pleasant walkway along the river that has some nice greenery along it; there's no room for trees in Tokyo.
Distance to the Museum
But what could be on the roof? A giant casting of a robot from Laputa: Castle in the Sky! There was a long line in front of the robot with people waiting to get their picture taken in front of it. A person was about as tall as a leg of the robot. There were even plants growing in various places on the sculpture!
The whole outside of the museum seemed like a garden because of the numbers of plants growing on and around it.
There was also a skylight on the roof, looking
down into the fan with the airplane wings. Also, there was also a model of one of the cube-things from Laputa, off in the corner of the rooftop. (It wasn't nearly as popular as the statue of the robot, though.)
Then, after returning to the third floor, we explored the rest of the inside. There were a few rooms devoted to endless pictures of the production of Spirited Away. There was even a huge stack with piles and piles of (I believe) the cels to the movie. They took up a giant glass case in the middle of the room. The walls of the room had pictures from practically every scene to the movie.
There was also a gallery with framed cels of all of Studio Ghibli's movies. Some were replicas that one could buy (for a lot of money). but others were originals on display.