Run by the Bank of Japan, the Currency Museum traces the long history of money in the country, from the use of imported Chinese coins in the late Heian period (12th century) to the creation of the yen and the central bank in the second half of the 19th century. See beautiful Edo-era, calligraphy-inscribed gold bullions, occupation-era notes from Indonesia and the Philippines, Siberian leather money, and Thai leech coins. Want to know how much ¥100 million weighs? You'll get to lift that pile of money here, which is as thick of two phone books, kept safely inside a perspex box.
FREE entry.