Ueno district in Tōkyō is home to the National Museum and other museums, Ueno Park, several temples, and a Shintō shrine dedicated to one of the greatest Shōguns. Ueno Station provides easy access.
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Osaka's Ebie Sewage Treatment Plant — Toilets of the World
THe Ebie Sewage Treatment Plant in Osaka was once home to the Sewerage Science Museum. The museum is closed, but I visited the plant. All this and more on the Toilets of the World.