Established in 2005 by the United Nations General Assembly. On that day, in 1945, the Red Army liberated the Auschwitz-Birkenau concentration camp. http://www.auschwitz.org/muzeum/historia-muzeum/od-wyzwolenia-do-powstania-muzeum/ (on liberation of the Auschwitz-Birkenau concentration camp, on the website of the Auschwitz-Birkenau Museum)