the floor was drained and the inner and outer conservation was done. Old roof tiles were broken so the water poured inside. The roof tiles, which were not the original roof cover, were replaced with the lead cover and new, modern roof tiles, rotten wooden floor was replaced with the brick slabs and the wooden covering of the tomb was also replaced. Museum of Natural History (1830s-1840s) The venue is located on the Great Ravelin. It was built in the 1830s or the 1840s. It originally served to house Ottoman guardsmen, so it is not a spacious object, covering . In 1957, the Museum of Forestry and Hunting was relocated from the Residence of Prince Miloš in Topčider into the building. In 1973, the museum was annexed to the Museum of Natural History. After the Museum of Forestry and Hunting was officially abolished in 1994, the building became a gallery of the Museum of Natural History. It has 35,000 visitors yearly. Institute for the Protection of Cultural Monuments (1904) The original building was built from 1902 to 1904, to serve as the headquarters of the Serbian General Staff. It was demolished during the Austro-Hungarian bombing of Belgrade across the Sava in October 1915. It was decided to build the new headquarters on the same location. In the post-war situation, when funds were low and urgency was needed to repair the damages, it was decided to erect two temporary structures. One building was constructed on the location of the First Southwest Rampart's bastion, while the other one was built on the foundations of the 1904 building. The rebuilt building was designed by Janko Šafarik, in the typical manner of the 19thy century Serbian urban architecture. Facade and surrounding features include socle made of natural stone, side staircase of artificial stone, and fence and candelabra made of cast iron. When the general staff was moved into the new building in the Kneza Miloša Street in 1928, the building in the fortress was turned into the Military museum. In 1956, the museum was relocated to the nearby, much larger building of the Military and Geography Institute, the auxiliary building on the rampart was demolished, and the Institute for the Protection of Cultural Monuments moved into the remaining building in 1961. The building's facade was fully renovated in the fall of 2021. Bunker (1948–1949) In 1948, after the Informbiro resolution and the ensuing Tito–Stalin