Monday is Holocaust Remembrance Day, marking 80 years since the liberation of Auschwitz-Birkenau, the largest Nazi concentration camp. In Massachusetts, two Holocaust survivors said their experience has never left them.

Monday, somber ceremonies were held across the world and in the Bay Area to mark Holocaust Remembrance Day in honor of the more than six million Jews and other groups murdered at the hands of the Nazi regime.

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.

The Nebraska Stories of Humanity website holds more than 1,300 documents to mark the events of the Holocaust from those who settled in Nebraska.