The Croatian Museum of Natural History, one of the largest museums in Croatia, is located in a historic noble palace on the ramparts of Zagreb's Upper Town. From 1797 to 1834, Zagreb's first public theater operated there, the famous Amadeo Theater, named after its founder and manager: the Hungarian count Anton Amadeo de Varkony, the great prefect of Zagreb.
The extension and reconstruction project modernized and increased the area of the museum's permanent exhibition and created new public spaces on the ground floor of the Amadeo Palace. The works included deepening the basement below the entire surface of the building and lowering the staircase and elevator to the new level of the basement. The wooden ceiling structures of the first and second floors were replaced by a coupled AB pressure plate ceiling structure and HEA supports. The roof structure consists of steel frames in the transverse direction, steel beams in the longitudinal direction and wooden rafters. The yard is covered with a glass roof. The main steel girders are supported on the east and west wings, and secondary glass girders are placed in the vertical direction. The eastern and western wings are connected by bridges.
