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東京スカイツリー
Completed in 2012, Tokyo Skytree stands tall over the old Sumida ward as the newest symbol of Tokyo and the world's tallest self-supporting tower at 634 m. It is the primary location from which digital television broadcast signals in Tokyo are transmitted. The tower's LED lighting system uses a different color scheme every night. The Skytree is complemented by a shopping complex, Tokyo Solamachi (Tokyo Skytree Town).
江戸東京博物館 Edo-Tōkyō-hakubutsukan
This bizarre multi-story edifice suspended in midair and bearing not a small resemblance to a Star Wars Imperial Walker (meant to be a replica of an old raised warehouse) covers the history of the metropolis, starting from 1590 when it was selected as Japan's new capital Edo, all the way through the Kanto earthquake and firebombings of World War II. The museum is built with the latest technology including life-size replicas of entire buildings and the Nihombashi Bridge. Free informative tours are available in several languages, depending on which volunteers are around; audio guides in several languages always available. Pair it up with a visit to the more intimately sized Fukagawa Edo Museum in nearby Kōtō ward, just a couple of stops away on the Toei Ōedo subway line.
刀剣博物館
Display of all types of Japanese art swords and fittings, some of them centuries old. Beautiful view from balcony on 3rd floor over Kyū Yasuda Garden. Quite hefty entrance fee, but a must see for anyone interested in Japanese swords.
両国花火資料館 ryōgoku hanabi shiryōkan
相撲博物館, sumō hakubutsukan
A small, quirky museum tucked inside the arena's first floor, dedicated to the history of sumo, particularly artifacts and ceremonial clothing, almost entirely in Japanese only. The collection rotates several times a year. During sumo tournaments, it is open daily, but only to tournament ticket holders.
たばこと塩の博物館 Tabako to Shio no Hakubutsukan
This peculiar institution owes its existence to Japan's government monopoly on these two substances. The website advises that "dangerous substances are not permitted within the museum". They have map-guides of the museum in English and most exhibits have English translations. There is a free mobile-app based auto tour as well.