NS Documentation Centre of the City of Cologne NS Documentation Centre of the City of Cologne The NS Documentation Centre of the City of Cologne () was founded by a resolution passed by the Cologne city council on December 13, 1979 and has become the largest regional memorial site in all of Germany for the victims of the Nazis. Since 1988, it has been housed in "EL-DE Haus," the EL-DE building, named for the initials of its owner, Catholic businessman Leopold Dahmen. This building was the headquarters of the Cologne Gestapo (secret police) between December 1935 and March 1945. In the final months of the war, several hundred
Cologne In January, the mean temperature is , while the mean temperature in July is . Temperatures can vary significantly over the course of a month with warmer and colder weather. Precipitation is spread evenly throughout the year with a light peak in summer due to showers and thunderstorms. Cologne is regularly affected by flooding from the Rhine and is considered the most flood-prone European city. A city agency ("Stadtentwässerungsbetriebe Köln", "Cologne Urban Drainage Operations") manages an extensive flood control system which includes both permanent and mobile flood walls, protection from rising waters for buildings close to the river banks, monitoring