Speaking Of Roof Structure...

(Click on photo to enlarge)
I can't write the words "roof structure" (like I did in the piece about the Baur BMW below) without thinking of Fiat's Giacomo Mattè Trucco designed Lingotto building and its rooftop test track. The building and track operated from 1923 until 1982.

The building still exists and has since been rebuilt into a modern complex, with concert halls, theatre, a convention centre, shopping arcades and a prestigious hotel.

Just thought I'd share.