il lingotto - a track on the roof in 1923

Lingotto is a district of Turin, Italy, and the location of the Lingotto building in Via Nizza. This building once housed an automobile factory built by Fiat.

the track for cars on the roof of the lingotto

Construction started in 1916 and the building opened in 1923.

 The design (by young architect Matté Trucco) 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 to go onto the test track. 

It was the largest car factory in the world

 at that time. 

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". 

80 different models of car were produced there 
in its lifetime, including the Fiat Topolino of 1936

wikipedia