After the Romans, the structure was further built, rebuilt, developed and modified throughout the centuries by the Byzantines, Hungarians, Serbs, the Ottoman Turks, and the Austrians (Habsburgs).
Belgrade Fortress has two levels - the upper and the lower one. Nowadays, in the back, on the downhill opposite to the rivers, Belgrade Zoo is located. The upper level is turned into a seemingly vastly large "Kalemegdan Park" with lots of monuments honoring famous people from the Serbian history. In addition, there you can find an art pavilion ("Cvijeta Zuzorić"), the Military Museum, the Despot Stefan Tower (built around 1405, after Serbia became a Despotate under the rule of Stefan Lazarević, and Belgrade becoming the capital of the state), a dungeon called the "Roman Well", and the statute of the "Victor", considered as the main symbol of Belgrade.
In the lower part you can find Kula Nebojša ("Dardevil Tower"), two orthodox churches of Sveta Petka and Ružica, and the Belgrade Planetarium.
On Sunday, September 3rd, 1939, Belgrade hosted a Grand Prix race (competition that evolved into Formula 1 after WWII) around the Fortress with more than 70 000 people in attendance. So when you cross the street to enter the "Kalemegdan Park", imagine powerful engines racing there nearly 80 years ago, imagine the fumes, the crowd cheering, and you'll get an idea of Belgrade, the place with such an abundant history, and with stories emerging from every stone embedded in its roads.
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