Vespa Racing on Fiat's Lingotto Rooftop Test Track
The Lingotto building in Turin, Italy was once home to the largest automobile factory in Europe. The factory, built in 1923 for manufacturing Fiats, had an extremely unique design that hasn't been copied since. The orientation of the assembly-line was odd, in that it extended over 5 floors, with auto parts entering on the ground floor and completed cars surfacing on the roof top. More at source.
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It looks like it can use some improvements in safety.