seals and was adopted as part of the Serbian coat-of-arms after First Serbian Uprising in 1804, it was meant to show the incorporation of Serbia into the western empire. The gate was damaged already during the heavy Allied Easter bombing in April 1944. It is not known whether Ahnenerbe was searching for something specifically or just wanted to falsify the route by which Aryans reached Germany from the Middle East. Some surviving documents show that they discovered remains of Celtic and Gothic settlements, a trench from the Roman period and relics from the Austrian rule after the conquest of Eugene of Savoy. Some sources claim that after the bombing started, documentation and part of the artifacts were transported to Lebus, in Germany and are considered to be lost. Others claim that the entire material was stored in the Belgrade City Museum. What is known for sure is that during the "terrain cleaning" in 1941–1942, the Germans completely destroyed the foundations of the Austrian artillery barrack built in the 1723-1736 period. Post war On 29 February 1952 the city adopted the "Decision on protection, adaptation and maintenance of the people's park of Kalemegdan" which set the borders of the protected areas as the rivers of Danube and Sava and the streets of Tadeuša Košćuškog and Pariska. In 1962, Belgrade's Institute for the cultural monuments protection expanded the zone to several blocks across the streets. Detailed plan on Kalemegdan from 1965 provided that, despite the immense archaeological value that lies beneath the fortress ground, basically only what was discovered by that time can be explored, restored or protected. That caused the problem both for the expansion of the park but even more for the further exploration of the fortress' underground. Best example is the Lower Town where neither the park fully developed nor the remains of the former port, which was located there, are visible. The area of the fortress is . By 2000, only 5% of that area was archaeologically surveyed, and by 2010 that number rose to 12% or . Based on the findings so far, it is estimated that during the rule of despot Stefan Lazarević in the first half of the 15th century, when Belgrade became capital of Serbia, the city within the fortress had 5,600 to 12,000 inhabitants. Archaeological examinations were done on the following locations: Upper Town in the inner fortress; surveyed 1948–2009; found remains belong