Tokyo Sky Tree
Tokyo Sky Tree is the tallest building in Japan, and is close to Asakusa and Sumida River. Tickets to the tower are available for 2,000-4,000 yen depending on where you go (there are two observation decks in 350m and 450m high). Sky City is located at the base of Tokyo Sky Tree and contains many restaurants, shops, etc. An aquarium is just right next to the tower too.