Paracuellos massacres
1936 CE.
Shown on the map at 40.505°, -3.530°.
The Paracuellos massacres (Spanish: Matanzas de Paracuellos) were a series of mass killings of prisoners of war deemed to have been part of or supporting the Nationalists by the Republican faction of the Spanish Civil War that took place before and during the Siege of Madrid during the early stages of the war. The death toll remains a subject of debate and controversy.
Text from the Wikipedia article Paracuellos massacres, licensed CC BY-SA 4.0.