mayoral tenure of Đilas ended. The third project is controversial Belgrade Waterfront project. The fortress in general functions as a major archaeological, artistic and historical treasury. As of 2014 it comprised: 19 memorial busts of important people from Serbian history, science and arts (Jovan Skerlić, Miloš Crnjanski, Jovan Dučić, Đura Daničić, Stevan Mokranjac 18 registered archaeological digs (horseshoe towers, remnants of the Metropolitan's palace, Roman Castrum, building of the main guards) 6 monuments and memorials (Pobednik, Monument of Gratitude to France, Despot Stefan Lazarević's Monument) 4 restaurants and coffee shops 4 sports terrains 3 sculptures ("Genius of death", "Tired fighter", "Partisan with children") 2 fountains ("Awakening", "Fisherman") 2 drinking fountains ("Japanese", "Mehmed Paša Sokolović") 2 churches (Ružica, Saint Petka) 2 galleries (of the Natural Museum, Inner Stambol Gate) 2 museums (Military Museum, Nebojša Tower) Cvijeta Zuzorić Art Pavilion, City Institute for the protection of the cultural monuments, Belgrade Planetarium, Luna Park, Belgrade Zoo, People's Observatory, Music Pavilion, Serbian Academy of Sciences and Arts' Archaeological Institute's Science and Research Center for the Fortress, Memorial Ossuary for the 1914–15 defenders of Belgrade Tomb of People's Heroes, containing the remains of the Communist party members and war heroes Ivan Milutinović, Đuro Đaković, Ivo Lola Ribar and Moša Pijade. The tomb was built for the first three in 1948, using the granite slabs intended for the construction of the Church of Saint Sava. Stevan Bodnarov sculptured their busts in 1949. After his death in 1957, Pijade was also buried in the tomb, and his bust, work of Slavoljub Stanković, was added in 1959. The complex was declared a cultural monument in 1983. Since the 1990s, the tomb has been frequently vandalized. After being vandalized three times in one year, members of organizations claiming Communist heritage organized citizens' watches to guard the tombs in December 2020, but desecrations continued in 2021 and 2022. Concerts and shows The flat grounds below the fortress are occasionally used as open-air concert location during late spring and summer: 3 September 1997: Partibrejkers Belgrade Beer Fest, annually from 2003 until 2007 18 June 2011: Amy Winehouse and Moby 15 September 2012: Warriors Dance Festival (The Prodigy, Skrillex) 24 May 2013: Đorđe Balašević 27 May 2013: Green Day (Belgrade Calling Festival, others: Atheist Rap, Superhiks, Hladno Pivo) 14 June 2013: Whitesnake 22 June 2013: Bajaga i Instruktori 17 June 2014: Iron Maiden (Maiden England World Tour, opening act: Ghost) 13 August