Zagreb – Ustasha HQ
When Germany invaded Yugoslavia in April 1941, a new state was formed out of former Yugoslav republics of Croatia and Bosnia and smaller parts of Slovenia and Serbia. This German-friendly state was named, the independent state of Croatia, and was led by Ante Pavelic and his ultra-nationalist fascist party, Ustasha. The party was headquartered in Zagreb, and the city was also proclaimed the capital. The party was driven by a racist/nationalist ideology where serbs, jews and roma were persecuted and murdered. Concentration camps were established throughout independent Croatia. The most famous are Jasenovac and Stara Gradiska.
The state ceased to exist in connection with the defeat of Nazi-Germany in May 1945. Pavelic lived in Italy for the first few years after the war, but fled to Argentina in 1948, where he lived under Peron’s protection. In 1957 he was subjected to an assassination attempt and Yugoslavia demanded his extradition. Fearing extradition, he fled to Chile, but after about four months he moved to fascist Spain, where he remained until his death in 1959. He is buried in the San Isidore Cemetery in Madrid.
Current status: Preserved (2023).
Location: 45°48'33.82" N 15°59'13.83" E
Get there: Walk from central Zagreb.
Follow up in books: Pavlowitch, Steven: Hitler’s New Disorder: The Second World War in Yugoslavia (2008).
As far as I know there are no monuments or anything else that informs about the history of the building. 2023 it seem to be a mix of homes and offices. Some 100 metres from the building at Zagreb central station, a locomotive is preserved next to a memorial dedicated to the victims murdered by either Ustasha or the Germans. The locomotive was used to transport prisoners to various concentration camps in Croatia.