Valley of Death

Valley of Death in Fordon, Bydgoszcz, northern Poland, is a site of Nazi German mass murder committed at the beginning of World War II and a mass grave of 1,200–1,400 Poles and Jews murdered in October and November 1939 by the local German Selbstschutz and the Gestapo. The murders were a part of Intelligenzaktion in Pomerania, a Nazi action aimed at the elimination of the Polish intelligentsia in Reichsgau Danzig-West Prussia, which included the former Pomeranian Voivodeship. It was part of a larger genocidal action that took place in all German occupied Poland, code-named Operation Tannenberg.

Source: Wikipedia