The Holocaust is marked and memorialized at places like Auschwitz, Bergen Belsen, Dachau. But nearly half of the six million Jewish victims were executed in fields and forests and ravines, places that were not named and remain mostly unmarked today. They were slaughtered in mass shootings and buried in mass graves in the former Soviet Union, where until very recently, little had been done to find them.
CBS News: The hidden Holocaust (VIDEO)
Holocaust survivors greet each others as they arrive to pay tribute to fallen comrades in the former Auschwitz concentration camp in Oswiecim, Poland, on the 70th anniversary of the liberation of the Nazi death camp on Jan. 27, 2015.
