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Without a doubt, the best sludge center you've ever seen. The incineration plant makes other waste facilities look like dumps. These two buildings were designed by eccentric Austrian architect Friedensreich Hundertwasser. They are fantastical works that have to be seen to be believed. There are display panels in the lobby of the sludge centre. Tours are available if you contact the facilities in advance, but Hundertwasser's work is on the outside: inside, these are functioning waste treatment facilities. When you arrive, make sure to check the bus schedule to find out when you can leave.
天保山ハーバービレッジ
Plaza and shopping centre, which houses an aquarium, Ferris wheel, an art gallery, Legoland and a cruise terminal. On the weekend, musicians and street performers offer additional entertainment to people outside the aquarium.
海遊館
This is one of the world's largest aquariums, with 11,000 tons of water and plenty of sharks (including a whale shark), dolphins, otters, seals, and other sea creatures. The largest tank, representing the Pacific Ocean with 5,400 tons is nothing but overwhelming. Can get intensely crowded, but the aquarium is a spiral featuring the same tanks, and crowds thin out as you get to deeper views of each tank. Back Stage Viewing is available for an additional fee.
天保山大観覧車
One of the largest Ferris wheels, overlooking Osaka Bay and surrounding areas such as Mount Ikoma to the east, Akashi Kaikyō Bridge to the west, Kansai International Airport to the south, and the Rokko Mountains to the north. 17-minute ride. There is an option of a gondola with a see-through floor for no additional cost, but lines for these gondolas tend to be dramatically longer as they are fewer and in greater demand (most report a fairly underwhelming experience too).
レゴランド・ディスカバリー・センター大阪