Gas chamber
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A gas chamber is an apparatus for killing humans or other animals with gas, consisting of a sealed chamber into which a poisonous or asphyxiant gas is introduced. Poisonous agents used include hydrogen cyanide and carbon monoxide.
Gas chamber at Majdanek concentration camp
Interior of Majdanek gas chamber, showing Prussian blue residue
The former gas chamber at New Mexico State Penitentiary, used only once in 1960 and later replaced by lethal injection.
Butovo firing range
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The Butovo Firing Range or Butovo Shooting Range was an execution site of the Soviet secret police located near Drozhzhino in Leninsky District, Moscow Oblast from 1938 to 1953. Its use for mass execution has been documented; it was prepared as a site for mass burial. According to Arseny Roginsky, "firing range" was a popular euphemism adopted to describe the mysterious and closely-guarded plots of land that the NKVD began to set aside for mass burials on the eve of the Great Terror.
Mound covering one of the mass graves at Butovo.
A wall in a memorial garden bearing the names of about 20,000 victims.
Seraphim Chichagov before being sentenced to death and executed
Jukums Vācietis after his arrest by the NKVD in 1937