Jewish business destroyed during Kristallnacht, 1938

Jews wearing Star of David badges, Lodz Ghetto, Poland, World War II, 1940-1944. The Nazis forced Jews into over-crowded ghettos from which thousands were deported to the death camps.

History of ethnic cleansing, Bosnian War refugeesJon Jones/Sygma/Sygma via Getty Images

Raoul Wallenberg - Swedish architect, businessman and diplomat, who saved thousands of Jews from the Holocaust in German-occupied Hungary. Pictured: Raoul Wallenberg while serving as Sweden's special envoy in Budapest, Hungary, in 1944.

Armenian Genocide, survivors gathered in the barracks at Aleppo, c1918.The Armenian Genocide refers to the deliberate and systematic destruction of the Armenian population of the Ottoman Empire during and just after World War I. It was implemented through wholesale massacres and deportations, with the deportations consisting of forced marches under conditions designed to lead to the death of the deportees. The total number of resulting Armenian deaths is generally held to have been between one and one and a half million. Other ethnic groups were similarly attacked by the Ottoman Empire during this period, including Assyrians and Greeks, and some scholars consider those events to be part of the same policy of extermination. It is widely acknowledged to have been one of the first modern genocides, as scholars point to the systematic, organized manner in which the killings were carried out to eliminate the Armenians, and it is the second most-studied case of genocide after the Holocaust. The word genocide was coined in order to describe these events. (Photo by: Pictures From History/Universal Images Group via Getty Images)

The Holocaust, during which some 6 million Jews, Gypsies, homosexuals and other people were systematically exterminated by Nazi Germany during World War II, was one of the most horrific war crimes ever committed.

Holocaust

The Holocaust was one of the worst war crimes ever committed. Learn more about Anne Frank, Kristallnacht, Nazi concentration camps and other Holocaust facts.

Holocaust: Definition and Facts | HISTORY

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World War II was the biggest and deadliest war in history, involving more than 30 countries. Sparked by the 1939 Nazi invasion of Poland, the war dragged on for six bloody years until the Allies defeated the Axis powers of Nazi Germany, Japan and Italy in 1945. Explore the battles, leaders and atrocities from the war and its impact on geopolitics and humankind.

Holocaust - Topics

Anti-Semitism

Auschwitz

Raoul Wallenberg

Kristallnacht

Anne Frank

Genocide

Ethnic Cleansing