Once a large car factory, now a shopping mall, the rooftop keeps a secret.
Fiat’s test track. Part of Lingotto’s industrial archaeology.
The futuristic looking glass dome is a multifunctional meeting room, built by the Agnelli family. Next to a heliport.

Curious how to get there?
Head for the first floor, look for the book shop, take the elevator to 4th floor and enter the Pinacoteca Giovanni e Marella Agnelli museum. They actually have 2 interesting artist on display.
Pablo Picasso & Matisse.