Gniewkowo
In a forest about 2.5 kilometers north of Gniewkowo as in turn is about 2.5 kilometers southwest of Torun, the Nazis killed around 4000 poles between 1939 and 1943. These were poles which were considered by the Germans to be a threat to German supremacy and had therefore to be eliminated. A quick and easy way for the Germans was to take them to a forest nearby where they were shot and buried in mass graves.
Current status: Monument (2023).
Location: 52°55' 07.79" N 18°24' 42.55" E
Get there: Car.
Follow up in books: Lukas, Richard C: Forgotten Holocaust: The Poles Under German Occupation 1939-1944 (2008).
Gniewkowo is hardly any of the more famous execution sites but it is well kept with a worthy monument and the graves are clearly marked in the surroundings of the monument.