Survivors of the Nazi's notorious Auschwitz death camp are taking center stage at the memorial service to mark 80 years since its liberation by Soviet troops.

Jan. 27 is International Holocaust Remembrance Day to memorialize the six million Jews and millions of other victims of Nazi persecution.

WGN's Shannon Halligan reports on ceremonies held around on the world on Holocaust Remembrance Day, and how world leaders are honoring those who so bravely risked their lives during one of the darkest times in modern human history.