Two-thirds of the Jewish victims of the Nazis have now been identified.
Since the Holocaust ended, there has been an ongoing effort to identify the six million Jews and millions more non-Jewish people slaughtered by the Nazis.
But 65 years on, there are still two million whose identities are not known.
Although the Nazis kept meticulous records during the Holocaust, many documents were destroyed during the war and whole families were wiped out.
