Düsseldorf is one of the economic centers of Germany and is located along the River Rhine in the densely populated Rhine-Ruhr metropolitan area, with a population of 593,682 (31 December 2012).
The city is famous for its nightlife, carnival, events, shopping and for fashion and trade fairs like the Boot Messe (one of the world's best trade fairs for boats and watersports) and Igedo (world leader in fashion). Every year, more than 4 million people visit the Kirmes fun fair which runs for 9 days in the summer.
The city was largely destroyed in World War 2, and there were very few old buildings left. People interested in modern architecture, however, will have much to see in Düsseldorf. Also, there are many modern artworks in the public, and on Stresemannplatz Square and the Rhine Bank, there are palms, not really the first thing you'd expect to see a cold day in October.