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Lingotto is the name of a district of Turin, as well as the name of the Lingotto building in Via Nizza. It once housed a car factory built by Italian automotive company Fiat and today houses the administrative headquarters of the manufacturer and a multipurpose centre projected by architect Renzo Piano.
Construction of the building started in 1916 and it was inaugurated in 1923. The design by the young architect Giacomo 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. The construction was carried out by the company of G A Porcheddu. 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.
By the late 1970s, the factory had become obsolete, having been superseded by the larger and more advanced Fiat Mirafiori factory, and a decision was made to finally close it in 1982. The closure of the plant led to much public debate about its future, and how to recover from industrial decline in general. An architectural competition was held, which was eventually awarded to Renzo Piano, who envisioned an exciting public space for the city. The old factory was restored into a modern complex, with concert halls, theatre, a convention centre, shopping arcades and a hotel. The eastern portion of the building is the headquarters of the Automotive Engineering faculty of the Polytechnic University of Turin. The work was completed in 1989. The track was retained, and can still be visited today on the top floor of the shopping mall and hotel.
Similar rooftop tests tracks exist, including; at Imperia in Nessonvaux in Belgium, and Palacio Chrysler in Buenos Aires, Argentina. From 1928 to 1958, Imperia had a track over 1 km long which was built partially on top of the factory.
References:The Walls of Constantinople are a series of defensive stone walls that have surrounded and protected the city of Constantinople (today Istanbul) since its founding as the new capital of the Roman Empire by Constantine the Great. With numerous additions and modifications during their history, they were the last great fortification system of antiquity, and one of the most complex and elaborate systems ever built. They were also the largest and strongest fortification in both the ancient and medieval world.
Initially built by Constantine the Great, the walls surrounded the new city on all sides, protecting it against attack from both sea and land. As the city grew, the famous double line of the Theodosian Walls was built in the 5th century. Although the other sections of the walls were less elaborate, they were, when well-manned, almost impregnable for any medieval besieger.