Cologne is Germany's fourth-largest city after Berlin, Hamburg and Munich, and is the largest city both in the German Federal State of North Rhine-Westphalia and within the Rhine-Ruhr Metropolitan Area.
For travellers in group (less than 5) you can get a special offer called NRW train ticket from DB to travel within Dusseldorf, Aachen, Colgone (famous cities) in one day.
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