an open book argent with pages edged gules. The bishop in the city's arms is the Bishop of Cologne. The wall symbolizes the city itself, and the inescutcheon in the gateway shows the Lion of Nassau in blue and gold (or yellow), which are Nassau's colours. The arms are based on the oldest known town seal, from 1248. The inescutcheon once also had gold billets (upright rectangles) around the lion, but these do not appear in what became the town's (and later city's) coat of arms in 1875. Sights Although the town was about 80% destroyed in the World War II, Siegen has kept a number of buildings worth seeing, such as the two stately homes, the Oberes Schloss and the Unteres Schloss. Oberes Schloss The castle on the Siegberg was first mentioned in a document in 1259 and was the family seat of the House of Nassau. Since 1905, the Siegerland Museum has been here. Alongside regional exhibits – among them an artificial demonstration mine – are many paintings. The centrepiece of this collection is made up of works by the man who is arguably the best known native, Peter Paul Rubens. There is also quite a comprehensive collection of portraits of members of the Houses of Nassau and Orange. The top floor is devoted to 19th-century home décor. A kitchen from the Siegerland, a bedroom and many pieces of furniture from the Biedermeier era give one an impression of life in the region in bygone days. Unteres Schloss Late in the 17th century, the Lower Stately Home came into being in its current form, somewhat like an open rectangle. The Evangelical line of the House of Nassau-Siegen resided here. Also belonging to the Schloss is the "Dicker Turm", or "Fat Tower" with a carillon. In 1959, the then town of Siegen built a memorial for victims of war and tyranny. Inside the Schloss is also found the crypt of the Evangelical branch of the Nassau princely house. Today, the Schloss serves as a state authority building in which the North Rhine-Westphalia Building and Property Establishment, the State Environment Office, the Office for Occupational Health and Safety and the Attendorn Correctional Facility (Siegen Branch Facility) are all housed. By the city's plans, a university is supposed to move into the Unteres Schloss within the next few years, but at this time, the plan is failing to find any financial