Former gas chamber

Natzweiler-Struthof was a Nazi concentration camp located in the Vosges Mountains close to the villages of Natzweiler and Struthof in the Gau Baden-Alsace of Germany, on territory annexed from France on a de facto basis in 1940. It operated from 21 May 1941 to September 1944, and was the only concentration camp established by the Germans in the territory of pre-war France. The camp was located in a heavily forested and isolated area at an elevation of 800 metres.

About 52,000 prisoners were estimated to be held there during its time of operation. The prisoners were mainly from the resistance movements in German-occupied territories. It was a labor camp, a transit camp and, as the war went on, a place of execution.

Source: Wikipedia