District 19 The Weinlehrpfad (Wine Walk) in Neustift-am-Walde. The small sculpture represents the "Reblaus" (Phylloxera) - a small louse that was imported on vines from North America and nearly destroyed European vines in the 19th century. All European grape vines are now grafted onto resistant roots.
District 9 The Fernwärmewerk Spittelau. The Garbage incineration plat on the bank of the Danube Canal produces heat for remote heating of houses and the nearby General Hospital. It was constructed in 1971, but after a fire it was modernized and decorated by Friedensreich Hundertwasser in 1987.
District 1 The official "elles" on the front wall of St. Stephan's Cathedral. put there so the public had official length measures. They are the "cloth elle" and the "linen elle". The word comes from the Roman length measurement but every country (or even city) had its own official length measures by the middle ages. The Cathedral has a long history - this part probably was built around 1230 - 1245.
