Paris is the capital of the French Republic. With around 2.17 million inhabitants, Paris is the fourth largest city in the European Union (EU). The metropolitan area is the largest metropolitan region in the EU with over 12.5 million people, making Paris one of the megacities. Paris is the political, economic and cultural center of France and, with four airports and six terminus stations, its largest transportation hub. Parts of the banks of the Seine are now UNESCO World Heritage Sites. The city is the seat of the United Nations Educational, Scientific and Cultural Organization (UNESCO) and also of the Organization for Economic Cooperation and Development (OECD) and the International Chamber of Commerce (ICC). Sights such as the Eiffel Tower, Notre-Dame Cathedral and the Louvre make the city a popular tourist destination.