CARDIFF, WALES - JANUARY 27: Cardiff City Hall lit up to mark Holocaust Memorial Day on January 27, 2021 in Cardiff, Wales. Holocaust Memorial Day is an international event that remembers the millions of Jews exterminated in World War II at the hands of the Nazis. The 27th January is the anniversary of the liberation of Auschwitz-Birkenau, the largest Nazi death camp, at the end of the War in 1945.