In 1967, Raspopović and Antić were asked to build the "21 October Museum", located in the Šumarice Memorial Park in Kragujevac. Designed with 33 projecting rectangles of different heights, the facade was covered with specially made exposed bricks. Finally completed in 1976, the museum was dedicated to the casualties of the World War 2 Kragujevac massacre. With no windows in the building’s walls, the interior space felt closed and inverted, representing the hopelessness felt by the victims before they died.