to the Prehistory, Antiquity, Middle Ages and Turkish-Austrian period waterfront rampart in Lower Town 1963–2010; Middle Ages and Turkish-Austrian period Kalemegdan Park 1973–2010; antiquity, Middle Ages and Turkish-Austrian period Belgrade Zoo 1988; antiquity, Middle Ages and Turkish-Austrian period In September 1969 major discoveries were announced. The appearance of the Lower Town was almost completely changed after the excavation. The medieval cobblestone was uncovered, so as the old ramparts and gates. In the process, the Lower Town was made more accessible to the visitors, including the new stairway and reconstruction of the part of the medieval rampart. In the Upper Town, four large, massive pillars from the period of despot Stefan Lazarević (15th century) were discovered. They are remains of the medieval bridge which was located in front of the main entry into the inner fort of the city. The fort was surrounded by the deep trench. It was previously known that an inner, bascule bridge existed within the fortress, which survived until the 17th century, but its exact location and type of construction were unknown. The explored sections after 2000 include the access downhill path to the Small Staircase in Kalemegdan Park, the bastion on the Sava slope, the gates of King, Sava, Dark and Karađorđe, the Great Ravelin, etc. During the 2017 reconstruction of the Mehmed Paša Sokolović's Fountain, next to Defterdar's Gate in the Gornji Grad, several archaeological discoveries were made. Remnants of the Roman castrum, two urns from the Bronze Age and remains of the Neolithic object were discovered. The findings were conserved and reburied. Features Belgrade Fortress is generally divided into four sections. The four sections, two of which make the fortress itself (Donji and Gornji Grad) and two make Kalemegdan park today, were divided by the Tsarigrad Road, on the location of modern pedestrian path next to the Cvijeta Zuzorić Art Pavilion. Lower Town Donji Grad (Доњи Град); occupies the slope towards the riversides, from the top spot (ridge where "The Victor" is). Between the lowest section and the Danube is Kula Nebojša ("Impregnable, Fearless, or Daredevil Tower"), which has been turned into a museum of the Greek revolutionary Rigas Feraios, who was strangled by the Turks in this tower and his corpse thrown into the Danube. Donji Grad, like the neighboring Savamala, frequently suffers from flooding, and Kula Nebojša suffered extensive damage during the major floods of 2006. The Orthodox churches of Ružica (former