London is a leading global city that excels in the arts, business, education, entertainment, fashion, finance, health, media, professional services, research and development, tourism and transport. London, together with New York City, is the world’s leading financial center, and is the city with the fifth largest GDP in the world, or the highest in Europe. This city is said to be the center of world culture. London is also the most frequently visited city, and is recorded as the city with the busiest airport in the world based on international passenger traffic. London’s 43 universities constitute the largest concentration of higher education in Europe. In 2012, London became the first city to host the modern Summer Olympics three times.