This is the second FIAT factory, planned in 1923, and takes its name from the shape which vaguely resembles a gold ingot. Avant-garde for its architecture and the technique of car construction, the work started at the bottom and worked up to the top with the test track on the roof of the building. Renovated by the architect Renzo Piano, it became a conference and exhibition centre, a shopping centre and the headquarters of FIAT. The auditorium dug into the interior, totally lined with cherry wood panels, is the most beautiful concert hall in Italy, with perfect acoustics.