Hamburg is the second-largest city in Germany (after Berlin) and along with its central port, also the second-largest port in Europe (after Rotterdam), ninth-largest port in the world, and the most populous city in the European Union which is not a national capital. The city is home to approximately 1.8 million Hamburgers, the demonym for the city's inhabitants. Hamburg's proper name is the Free and Hanseatic City of Hamburg (German: Freie und Hansestadt Hamburg). It makes reference to Hamburg's membership in the medieval Hanseatic League and also to the fact that Hamburg is a city-state and one of the sixteen Federal States of Germany. Tourists play a significant role in the city's economy. In 2007 Hamburg attracted more than 3.985.105 visitors (+3.7% to 2006) with 7.402.423 overnight accommodations (+3.1%). More than 700,000 people from abroad were visting for an average duration of stay of 2.1 days.More than 175,000 full-time employees and a revenue of €9.3 billion make the tourism industry a major economic factor in the Hamburg Metropolitan Region. Hamburg has one of the fastet growing tourism industry in Germany. From 2001 to 2007 the overnight stays in the city grew about 55.2%. A typical Hamburg visit includes a tour of the city hall and the grand church St. Michaelis (called the Michel), and visiting the old warehouse district (Speicherstadt) and the harbour promenade (Landungsbrücken). Sightseeing buses connect these points of interest. Of course, a visit in one of the world's largest harbours would be incomplete without having taken one of the harbour and/or canal boat tours (Große Hafenrundfahrt, Fleetfahrt) which start from the Landungsbrücken. Major destinations include also museums such as the Art Gallery and Gallery of Contemporary Arts. In 2008 the Internationales Maritimes Museum Hamburg opened in the HafenCity quarter.