Poland, Auschwitz-Birkenau State Museum, Birkenau Concentration Camp, Guard tower with barbed wire fencing.

Poland, Auschwitz-Birkenau State Museum, Birkenau Concentration Camp, Railway tracks leading to the camps main SS guard gate.

Poland, Auschwitz-Birkenau State Museum, Birkenau Concentration Camp, Ruins of gas chamber and crematorium Number 3 destroyed by the Nazis before evacuating the camp.

Poland, Auschwitz-Birkenau State Museum, Birkenau Concentration Camp, Ruins of gas chamber and crematorium Number 2 destroyed by the Nazis before evacuating the camp.

Poland, Auschwitz-Birkenau State Museum, Birkenau Concentration Camp, International Monument to the Victims of Fascism.

Poland, Auschwitz-Birkenau State Museum, Birkenau Concentration Camp, Railway tracks leading to area where the crematoria were located.

Poland, Auschwitz-Birkenau State Museum, Birkenau Concentration Camp, Ruins of former accommodation blocks surrounded by barbed wire fencing.

Poland, Auschwitz-Birkenau State Museum, Birkenau Concentration Camp, Guard tower with ruins of former accommodation blocks surrounded by barbed wire fencing.

Poland, Auschwitz-Birkenau State Museum, Birkenau Concentration Camp, Typical railway transport box car that brought Jews to the camp.

Poland, Auschwitz-Birkenau State Museum, Birkenau Concentration Camp, Typical railway transport box car that brought Jews to the camp.

Poland, Auschwitz-Birkenau State Museum, Birkenau Concentration Camp, Close up of barbed wire fencing surrounding ruins of former accommodation blocks.

Cambodia, Phnom Penh, Tour group looking at victims' portraits, Toul Sleng Genocide Museum S-21. Toul Sleng was a high school, taken over by the Khmer Rouge and turned into a prison, where people were...