I thought you might like to know about an organization named Yahad In Unum which is run by a French Priest named Father Patrick Desbois.
His mission is to find all of the thousands of sites in Eastern Europe where between 2-3 million Jews were massacred in small groups one bullet at a time.
Men, women, children and babies made to march to an area, dig their own graves, strip naked, then led a few people at a time to be shot.
They call it the Holocaust by Bullets.
Father Patrick goes into these small villages and speaks with older residents that remember where and when killings took place in their area.
There are thousands of areas most which are just now coming to light.
See: Holocaust by bullets