Frankfurt am Main, Germany's 5th-largest city, is a thriving metropolis with a cosmopolitan and international outlook. It is one of Europe's most important financial centres and home to the European Central Bank and the Frankfurt Stock Exchange. It is also the location of one of the world's largest trade fairs, Messe Frankfurt, famous for its annual motor show and book fair. This city combines the modern with the old, and the medieval city hall complex and cathedral stand side by side with 20th century skyscrapers. Its central location makes it a major traffic hub, which is well served by international airlines, an extensive road network and one of the largest rail stations in Europe.