Four Seasons Hotel Tokyo at Otemachi

Shelves deep in picture books and children's books, with original picture-book artwork always up on the walls.

Free, with Japan's money shown in order through its history and a corner where you feel how heavy 100 million yen in bills is.

Dozens of character shops in the basement under the station, from Pokémon, Kirby and Ultraman to Tomica and Plarail, Lego and the TV networks' own stores.

Minerals, fossils, animal specimens and century-old university furniture from the University of Tokyo's collections, plus a small chamber of curiosities.

Tomica cars and Plarail trains that pop out on a 3D screen, digital mini games, and a super-size Plarail diorama out front.

Tiny cars everywhere, plus store exclusives for a vehicle-obsessed child.