Transport in Copenhagen and the surrounding area relies on a well established infrastructure making it a hub in Northern Europe thanks to its road and rail networks as well as its international airport. Thanks to its many cycle tracks, Copenhagen is considered to be one of the world's most bicycle-friendly cities. The metro and S-train systems are key features of the city's well-developed public transport facilities. Since July 2000, the Øresund Bridge has served as a road and rail link to Malmö in Sweden. The city is also served by ferry connections to Oslo in Norway while its award-winning harbour is an ever more popular port of call for cruise ships.