Together with Basel (Bank for International Settlements), Geneva (United Nations headquarters in Europe), The Hague (International Court of Justice) and New York City (United Nations world headquarters), Strasbourg is among the few cities in the world that is not a state capital that hosts international organisations of the first order. The city is the seat of many non-European international institutions such as the Central Commission for Navigation on the Rhine and the International Institute of Human Rights. It is the second city in France in terms of international congress and symposia, after Paris. Strasbourg's historic city centre, the "Grande Île" (Grand Island), was classified a World Heritage Site by UNESCO in 1988. Strasbourg is immersed in Franco-German culture and although violently disputed throughout history, has been a cultural bridge between France and Germany for centuries, especially through the University of Strasbourg, currently the second-largest in France, and the coexistence of Catholic and Protestant culture. It is also home to the largest Islamic place of worship in France, the Strasbourg Grand Mosque.