- The Monument to the Unknown Hero is a colossal mausoleum atop of the Mount Avala. It was designed by the Croatian and Yugoslav sculptor Ivan Meštrović in 1938.
- The construction of the monument was initiated by King Alexander I, to commemorate the victims of the Balkan Wars (1912–1913) and the First World War (1914-1918).
- The medival Žrnov fortress was previously located on the same place.
- The mausoleum was designed in the Neoclassicism style, in the form of a Greek temple, with caryatids bearing the roof and representing the mothers of the fallen soldiers and all the peoples of the Kingdom of Yugoslavia.
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