Donja Gradina Memorial
A memorial site in the small village of Donja Gradina, on the right bank of the river Sava in present-day Bosnia Herzegovina, commemorates the mass killings of prisoners of the Jasenovac concentration camp. Between 1941 and 1945, the Croatian Ustaša deported tens of thousands of people to Jasenovac and murdered many
Source: https://www.memorialmuseums.org
Official Memorial website
Jasenovac concentration camp WWII
Jasenovac was a concentration and extermination camp established in the village of the same name by the authorities of the Independent State of Croatia (NDH) in occupied Yugoslavia during World War II. The concentration camp, one of the ten largest in Europe, was established and operated by the governing Ustaše regime, Europe's only Nazi collaborationist regime that operated its own extermination camps for Serbs, Jews and other ethnic groups.[4] It quickly grew into the third largest concentration camp in Europe. 
The camp was established in August 1941, in marshland at the confluence of the Sava and Una rivers near the village of Jasenovac, and was dismantled in April 1945. It was "notorious for its barbaric practices and the large number of victims". Unlike German Nazi-run camps, Jasenovac lacked the infrastructure for mass-murder, such as gas chambers and in turn "specialized in one-on-one violence of a particularly brutal kind", and prisoners were primarily murdered with the use of knives, hammers, axes or shot.
In Jasenovac, the majority of victims were ethnic Serbs (as part of the genocide of the Serbs); others were Jews (The Holocaust), Roma (The Porajmos), and some political dissidents. Jasenovac was a complex of five subcamps spread over 210 km2 on both banks of the Sava and Una rivers. The largest camp was the "Brickworks" camp at Jasenovac, about 100 km southeast of Zagreb. The overall complex included the Stara Gradiška sub-camp, the killing grounds across the Sava river at Gradina Donja, five work farms, and the Uštica Roma camp.
It is estimated that about 100,000 people were murdered in Jasenovac between 1941 and 1945, but some say as many as 700,000
Source: Wikipedia
Let us not forget what happened, and try to avoid war.
