The largest cities in the Rhine-Ruhr area are Cologne, with over one million inhabitants, followed by Düsseldorf, Dortmund and Essen, each of which has slightly more than 575,250.
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With almost 3.8 million inhabitants, the undisputed number 1 is the German capital of Berlin. Each of the city's districts has its own unique atmosphere, from chic to grung to hip to international. Of course, there are plenty of places of interest here, including the Brandenburg Gate and the Reichstag building.