Frankfurt is an important international finance, trade fair and service centre and is the home to the European Central Bank, the German Bundesbank and the Frankfurt Stock Exchange. It is also one of the most important transport hubs in Europe thanks to Frankfurt airport - Europe's third largest airport in terms of passenger numbers -, Frankfurt (Main) central train station and the Frankfurter Kreuz motorway interchange. Some 680,500 call Frankfurt home and more 604,500 come to work in the city each day. The greater Frankfurt RheinMain region has 5.5 million inhabitants. One of Frankfurt's most striking features is its imposing skyline with skyscrapers which are among the highest in Europe. Frankfurt's Zeil district and Goethestraße are among the most visited, and most profitable, shopping areas in Germany.