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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.

Langerfeld is a borough of the German city of Wuppertal.On 24 June 2018, an explosion in the area damaged an apartment complex and surroundings. The blast was powerful and destroyed the three top floors of the block, and also destroying a parked car. The impact caused fires inside the building. Twenty-five people were injured, five of them seriously.