(Thuringian average: -0.8; national average: +4.6). The most important regions of origin of Mühlhausen migrants are rural areas of Thuringia as well as foreign countries like Poland, Russia, Ukraine, Hungary, Serbia, Romania and Bulgaria. Like other eastern German cities, foreigners account for only a small share of Mühlhausen's population: circa 1.6% are non-Germans by citizenship and 4.2% overall are classified as migrants (according to the 2011 EU census). Differing from the national average, the largest groups of migrants in Mühlhausen are Russians and Ukrainians. Due to the official atheism of the former GDR, most of the population is non-religious. 19.8% are members of the Evangelical Church in Central Germany and 10.3% are Catholics (according to the 2011 EU census). Culture, sights and cityscape Museums There are several museums in Mühlhausen: The Müntzergedenkstätte inside St. Mary's Church was opened in 1975 and shows an exhibition about Thomas Müntzer and various other items of cultural history. The Bauernkriegsmuseum inside the Corn Market Church shows an exhibition about the Bauernkrieg (German Peasants' War) and its importance for German history. The Museumsgalerie inside the All Saints Church hosts some art exhibitions: a permanent one with Thuringian art of different epoques and temporary ones of modern art. The Museum am Lindenbühl exhibits the municipal history of Mühlhausen and the regional history of north-western Thuringia including natural history and archaeology. The Wehrgang is part of the medieval city wall, accessible next to the Frauentor gate. It gives access to a large stretch of the city walls and the towers. Cityscape The historic city centre of Mühlhausen consists of three parts. Within the inner city wall are the old town (south of Schwemmnotte river around Untermarkt and St. Blaise's Church) and the new town (north of Schwemmnotte river around Obermarkt and St. Mary's Church). The former suburbiums of Mühlhausen are situated between the inner and the outer city walls. Like the inner city, they are of medieval origin, but in contrast from the core, this area was overbuilt often during the city's later history and today shows a mixture of old and new buildings. Within the inner city walls, most buildings date back to the Middle Ages. In the late 19th and the 20th century, the city grew into all directions and a relatively low density of buildings is typical for Mühlhausen, so that the built-up area is very large in relation to the number of inhabitants.