Some WW2 mass graves actually have bodies in them
(WorldWar3)https://en.wikipedia.org/wiki/Bleiburg_repatriationsIn May 1945, after the end of World War II in Europe, during which Yugoslavia had been occupied by the Axis powers, tens of thousands of soldiers and civilians associated with the Axis powers fled Yugoslavia to Austria as the Soviet Union (Red Army) and Yugoslav Partisans took control. When they reached Allied-occupied Austria, the British refused to accept their surrender and directed them to the Partisans instead despite knowing that they would be killed.[1][2][3] The prisoners of war were subjected to forced marches, together with columns captured by other Partisans in Yugoslavia. Tens of thousands were executed; others were taken to forced labor camps, where more died from harsh conditions. The events are named for the Carinthian border town of Bleiburg, where the initial repatriation was carried out, hence the Bleiburg repatriations or Bleiburg Tragedy.
Discussions about the post-war massacres were forbidden in Yugoslavia, so the investigations of mass grave locations began only in the 1990s, after the fall of communism.[225] In 1992, 1163 bodies were excavated from 23 mass graves in the forests of Macelj, leaving around 130 possible mass grave locations unexplored.[226] In 2002, the Slovenian government established the Governmental Committee for Settlement of Questions on Secret Mass Graves, with the assignment of "recording of data about the number and locations of mass graves" after the end of World War II.[225]
The Tezno mass graves near Maribor were discovered in 1999 during the construction of a motorway. 1,179 corpses were excavated from a 70 meter long part of the trench. In 2007, the Commission on Concealed Mass Graves in Slovenia, founded in 2005, analyzed the entire Tezno trench and found human remains at a length of 940 metres, estimated to contain the remains of around 15,000 victims.[188] In 2009, the Barbara Pit near Huda Jama in Slovenia was uncovered, and 726 human remains were exhumed by December 2009.[227] The same year, more pits were uncovered on two locations near the Croatian-Slovenian border, one near the village of Harmica and the other near Gornji Hrašćan, estimated to hold, together, around 4,500 bodies.[228]
By mid 2008, 581 concealed grave sites were registered by the Slovenian Commission on Concealed Mass Graves. The number rose to more than 600 grave sites in 2010. The commission estimates that there are around 100,000 victims in those graves in Slovenia alone.[229] Unlike in Slovenia, there was no serious research of mass graves in Croatia by the Croatian government.[230] In 1991, the Croatian Parliament established the Commission for Determination of War and Post-war Victims. The commission began its work in 1994, but was abolished in 2002, with no significant contribution to the research.
Guess who doesn't want these actual provable victims commemorated:
"The World Jewish Congress and the Wiesenthal Center joined in condemning the Bleiburg commemoration, with the World Jewish Congress stating the event has been “used to glorify individuals who supported or were actively involved in the activities of a regime which had executed hundreds of thousands of innocent men, women, and children only because of their ethnic or religious identity”