Synagogues across the city and around the world mark Holocaust Remembrance Day.

Gene Klein is a Holocaust Survivor and one of the last remaining survivors of the Auschwitz Concentration Camp in Poland.

He is also the subject of the book, "We Got the Water: Tracing My Family's Path Through Auschwitz."

Klein lost his father in the Holocaust, and says he hopes people will take a minute, either Sunday night or Monday, to just pause and reflect.

"Remember those who died, who were murdered, including my father. For 16 years, I thought my father was the best father in the world — you know, of course you do that," Klein said in an interview with NY1's Kristen Shaughnessy. "He was murdered and it's unbelievable, this huge amount."

Six million Jewish people were murdered during the Holocaust.