Cologne (German: Köln) is a large city in the western territory of the former nation state of Germany. Cologne is located near the river Rhine. The most famous sight of the city is the Cologne Cathedral. The motto of Cologne is to "live and let live".
The Cologne Cathedral became badly damaged during World War III. The restoration of the cathedral was completed in 2392. (Dragon Ball Z vs. Star Trek: The Way of Infinity)
Cologne is also the hometown of the Colognefighters TNG.
Rene Michael had a house in Cologne. (Dimensional Prophecy of Zohar)