Cologne belonged to the Roman Catholic Church, the largest religious body, and 15.5% to the Evangelical Church. Cologne is the seat of the Roman Catholic Archdiocese of Cologne. There are several mosques, including the Turkish-Islamic Union for Religious Affairs run Cologne Central Mosque. Cologne also has one of the oldest and largest Jewish communities in Germany. The city's administration is headed by the mayor and the three deputy mayors. The long tradition of a free imperial city, which long dominated an exclusively Catholic population and the age-old conflict between the church and the bourgeoisie (and within it between the patricians and
NS Documentation Centre of the City of Cologne the best pre-served prisons from the Nazi era, representing an historical asset of national and European importance. Since June, 1997, the permanent exhibition in the EL-DE building has depicted political, social and community life in "Cologne During the Nazi Era." That includes the seizure of power and the power apparatus, propaganda and the "national community," everyday life, youth culture, religion, racism, the genocide of Cologne's Jews and its Sinti and Roma, and opposition, resistance, war and society during war. In addition, temporary exhibitions depict local and national aspects of the Nazi regime. The center also mounts more than 130 events