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Children place flowers at the Holocaust Memorial commemorating the persecution of the Jewish people during World War II, in Thessaloniki, northern Greece, on Sunday, Jan. 27, 2013. There were some 50,000 Jews living in Thessaloniki at the start of World War II, and almost 45,000 perished at Auschwitz concentration camp, and Greece officially commemorates the Holocaust every Jan. 27. (AP Photo/Nikolas Giakoumidis)

Holocaust Remembrance Day

International Holocaust Remembrance Day marks the liberation of the Auschwitz Nazi concentration camp on Jan. 27, 1945. Holocaust survivors, politicians, religious leaders and others marked the day with prayers.