This article presents the results of archaeological research of the post-Second World War mass grave site of Jama pod Macesnovo gorico in Slovenia. The surroundings of the killing site and the mass grave have been the subject of various investigations, including the exhumation of human remains in 2022. In addition to the human remains of approximately 3450 individuals, the results of metal detector surveys, and the excavation of the grave itself have yielded thousands of artefacts associated with the victims and perpetrators, shedding light on the events of the post-Second World War period and mass murder of opponents of the communist-oriented national liberation movement and new Yugoslavian regime. The study represents the results of the most extensive exhumation of war victims’ remains in Slovenia and demonstrates the significant role of archaeology in the reconstruction of historically poorly documented events in modern conflicts.