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On top of the Lingotto building in Turin. It was once an automobile factory built by Fiat. The building opened in 1923 was unusual in that it had five floors, with raw materials going in at the ground floor, and cars built on a line that went up through the building. Finished cars emerged at rooftop level, where there was a rooftop test track. It was the largest car factory in the world at that time. 80 different models of car were produced there in its lifetime, including the famous Fiat Topolino of 1936.
