Rooftop racetrack in Lingotto building, Turin, Italy

This is the old 5 story Lingotto building in Lingotto, Turin, Italy.
At one time, when owned by Fiat, it was the world's largest car factory.

Car production started at ground level and as each car reached another stage of completion,
it was moved up another floor until it reached the rooftop, hopefully finished,
and ready to be raced around the test track on top of the factory.