Lingotto

For its time, the Lingotto building was avant-garde, influential and impressive—Le Corbusier called it "one of the most impressive sights in industry", and "a guideline for town planning".

An architectural competition was held, which was eventually awarded to Renzo Piano, who envisioned an exciting public space for the city.

The old factory was restored into a modern complex, with concert halls, theatre, a convention centre, shopping arcades and a hotel.

Similar rooftop tests tracks exist, including; at Impéria in Nessonvaux in Belgium, and Palacio Chrysler in Buenos Aires, Argentina.

The building is also featured in the fourth episode of the 20th season of The Amazing Race, originally aired in the United States on March 11, 2012.

Historical view of Lingotto building with the test track on the roof (1928)
Helix access ramp to move cars up to a higher level of the former Fiat factory (2013)
The Palazzina building (2011)