The Nazis used gas vans and gas chambers as a method of systematic mass murder. They first experimented with the use of lethal poison gas in the so-called Euthanasia Program. The Nazis later applied gassing methods to murder millions of Jews and other victims at the killing centers.
Hartheim castle, a euthanasia killing center where people with physical and mental disabilities were killed by gassing and lethal injection. Hartheim, Austria, date uncertain.
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Buses that transported patients from the Eichberg hospital near Wiesbaden to the Hadamar euthanasia center, where the patients were gassed or killed by lethal injection. Germany, between May and September 1941.
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In August 1943 a gas chamber was installed in this building, seen here after the liberation of the camp, in the Natzweiler-Struthof concentration camp. France, 1945.
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Interior of a gas chamber at the Majdanek camp. Majdanek, Poland, after July 24, 1944.
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Zyklon B pellets found at the liberation of the Majdanek camp. Poland, after July 1944.
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Postwar photograph of gas chamber for mass murder in the Auschwitz main camp. Poland, ca. 1947.
In mid-August 1940, Auschwitz concentration camp authorities put into operation a crematorium adjacent to a morgue. This building was located just outside the boundaries of the Auschwitz main camp. In September 1941, the morgue was converted to a gas chamber for mass murder where several hundred people could be killed at a time. This gas chamber was used until December 1942, though the crematorium remained in operation as late as July 1943. In 1944, camp authorities dismantled the crematory furnaces and transformed the building into an air raid shelter for the SS hospital and for SS officers working in camp administration buildings nearby. During the creation of the Auschwitz-Birkenau State Museum in 1947, two crematory furnaces were reconstructed using original parts and the crematory chimney was rebuilt. Around this time, the air raid shelter walls were demolished to allow visitors to the museum and memorial to view the reconstructed gas chamber and crematorium space.
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![Personal effects taken from the prisoners at Auschwitz before they were taken to the gas chamber. [LCID: 14877]](https://encyclopedia.ushmm.org/images/thumb/54298492-3a93-46ac-a80a-8ff9cedeef62.jpg)