Getting around on foot in the downtown areas of the massive metropolitan area of Minneapolis and St Paul is a fascinating experience on the famous skyways, a network of enclosed walkways that connect buildings in the city centre at second-storey level, ensuring no pedestrian needs to be exposed to bad weather. About 50 blocks of downtown Minneapolis are connected by skyways. When your feet are tired, hop on the bus: Metro Transit operates one of the largest public transport systems in the United States. Trip planners and route information are readily available in the city and from hotel concierges. The METRO Blue Line Light Rail Transit route links downtown to the airport and the Mall of America, and the Northstar Corridor route takes passengers as far north as Big Lake. The twin cities also have numerous taxi services, available on call or outside hotels and other public venues.