Cologne is a city in the Federal Republic of Germany, in the state of North Rhine-Westphalia. The millionaire city of Cologne is the fourth most populous and the third largest city in Germany.
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In addition, Cologne is the largest center for the 10 millionth overdogglomeration of the Rhine-Ruhr region and the center for the 2 millionth monocentric agglomeration. "Metropolis on the Rhine", as Cologne is often called, is one of the oldest cities in Germany, which played a significant role in the history of Europe throughout its existence, beginning with the Roman era. Cologne is famous for its main temple - Cologne Cathedral, one of the main Catholic churches in Germany.