Milan is one of the largest metropolitan areas in Italy and the world, a world-renowned historical and cultural city, one of the most developed and highest GDP regions in the world, and also one of the most developed economic regions in Europe. It controls 4% of the world's art treasures. It is the world's fashion and design capital and one of the three major metropolitan areas in Europe with the most influence in the fashion industry. As one of the top cities in the world, Milan is the largest metropolitan area in Italy, the economic capital, the capital of Lombardy, and the capital of the province of Milan. If Milan were a country, it would be the 20th largest economy in the world, and its regional GDP ranks highest in Europe. Milan is home to more than half of the world's famous fashion brands, with institutions established here for all famous fashion brands in the world. It is the headquarters of more than half of the world's top fashion brands and the leading of the world's four fashion capitals. It is a famous historical and cultural city and a place where designers from all over the world aspire to be. The great Leonardo da Vinci left behind his most brilliant works, and the Milan Cathedral, like a white flame, soars into the sky. The Scala Opera House represents the pinnacle of world opera. It is the headquarters of Italian fashion brands such as Armani, Versace, Fendi, Prada, Valentino, Dolce & Gabbana, Moschino, and Mediolanium. Milan Fashion Week influences global fashion.