Old factory building, circa 1934, used as concentration camp

Kemna concentration camp (German: Konzentrationslager Kemna, KZ Kemna) was one of the early Nazi concentration camps, created by the Third Reich to incarcerate their political opponents (ostensibly in protective custody) after the Nazi Party first seized power in 1933. The camp was established in a former factory on the Wupper river in the Kemna neighborhood of the Barmen quarter of Wuppertal. It was run by the SA group in Düsseldorf.

• http://en.wikipedia.org/wiki/Kemna concentration camp