Düsseldorf is the capital city of the German state of North Rhine-Westphalia. It is known for its vibrant arts scene, fashion industry, and trade fairs. The city is situated along the Rhine River and features a mix of modern architecture and historic buildings, including the famous Altstadt or Old Town. Düsseldorf is also recognized for its cultural institutions, such as the Kunstsammlung Nordrhein-Westfalen art museum and the Deutsche Oper am Rhein opera house. The city hosts several annual events, including the Düsseldorf Carnival, attracting visitors from around the world.