The Lingotto building in Turin, Italy, is a massive half-kilometer long reinforced concrete structure, five stories tall, that once housed the largest and most modern car manufacturing plant in Europe. Located in the heart of the city, its original owners —Fiat—made clever use of the available real estate by building a high-speed test track on the building’s unusual banked rooftop, where thousands of Fiats underwent testing once they came out at the end of the assembly line.

A Vespa racing event on the roof of Lingotto’s Fiat Factory, organized by Red Bull in 2011. Photo credit: www.motoblog.it