and overall 7.1% are classified as migrants (according to the 2011 EU census). In contrast to the national average, the largest groups of migrants in Gotha are Russians, Vietnamese and Ukrainians. Due to the official atheism of the former GDR, most of the population is non-religious. 18.2% are members of the Evangelical Church in Central Germany and 4.8% are Catholics (according to the 2011 EU census). Culture, sights and cityscape Museums Gotha hosts various museums, which are – together with the ducal buildings – promoted as the Gothaer Barock-Universum ("Baroque universe of Gotha"). Friedenstein Castle hosts the following museums: The Ekhof Theatre is a Baroque court theatre and the world's only 17th century theatre with original stage machinery still working. The Historic Museum hosts an exhibition about municipal and regional history and culture of Gotha. The Museum of Nature shows a natural history exhibition with animals, minerals and fossils. The Castle Museum contains the former ducal living rooms and several items of cultural history. The Ducal Museum opposite to the castle hosts the ducal collection of art, containing Egyptian antiques, Renaissance Old Masters paintings, Chinese and Meissen porcelaine and more. The Insurance Museum at Bahnhofstraße is Germany's only museum on the history of the insurance business, which has been important in Gotha since 1820. The Tivoli at Cosmarstraße is the place where the Social Democratic Party of Germany was founded and hosts a small exhibition on the party's history. Image gallery Cityscape The city centre of Gotha has two medieval parts: the old town around Hauptmarkt and the new town around Neumarkt. Both were walled until 1810, when the city walls were broken down and a boulevard was laid out in their place. Early-modern suburbiums were established to the south-west (around Dreikronengasse), to the west (around Große Fahnenstraße) and to the east (around Mohrenberg). The later 19th century brought larger growth in all directions. Especially the axis between the main station and the city centre received a representative development in capital-city style. Due to Gotha's function as a ducal residence, most buildings built between 1870 and 1914 were generous in size and many mansions were built. Only some outer districts show the typical German working-class tenements (e.g. around Oststraße and Seebergstraße). The largest Plattenbau settlement of Gotha was established at the western periphery during the late GDR period. In the 1980s, large areas of the western old town were demolished