Milan is the capital of Lombardy region and the center of its namesake metropolitan city , the fourth most populated in Europe after London, Madrid and Paris. In the cultural sphere, Milan has been the Italian center of the world music circuit since the 19th century thanks to the Teatro alla Scala. Today it is also recognized as one of the world capitals of fashion and industrial design, and one of the most important Italian university centers. In Milan's hinterland there is one of the poles of the Milano Rho-Fair, the largest exhibition center in Europe. Being one of the metropolises with the best economic opportunities, quality of life and innovation, it ranks as the only Italian city in the list of Alfa World Cities.
The Quadrilateral fashion of Milan is the district where jewelers, boutiques and design and furniture showrooms are concentrated. It ia called in this way because of its four important streets, famous for the numerous shops and studios of the most important fashion brands. The quadrilateral is enclosed between four main streets: via Monte Napoleone, via Manzoni, via della Spiga, corso Venezia. The heart of the fashion district is via Montenapoleone, which turns out to be the fifth most expensive and prestigious street in the world.