Though not part of the city walls, this historic mill was built in the 17th century. It was dismantled during the 19th century when it was no longer in function. It currently houses the seat of a voluntary organization, Socialist Youth of Germany.
Wikipedia https://ru.wikipedia.org/wiki/Боттмюле
More information http://www.stadt-koeln.de/leben-in-koeln/freizeit-natur-sport/veranstaltungskalender/die-bottmuehle-und-ihre-geschichte
Coordinates 50°55'22.133" N 6°57'47.095" E
