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, on the downhill on the Eastern side, the 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") - a wonderful exhibition house from 1928 in Art Deco style, then the Military Museum (with an open display of tanks, cannons, missiles and other weapons), 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 statue of the "Victor", considered as the main symbol of Belgrade.
There are a lot of nice fountains in the park, the big monument errected in gratitude to France, and a cosy promenade looking down on the river Sava, which is occasionally converted into an exhibition place, displaying artistic photos or various kinds of installations.
Entering the fortress' walls, you are going into a proper castle with wooden bridges, towers (like Clock Tower), inner city gates, canals that once were filled with water, and among these magnificent structures you will see tennis courts, basketball courts, walking paths, Gallery of the Natural History Museum and even a Dino Park, for children to play among the giant figures of creatures that once walked this Earth.
On the eastern side, close to Belgrade Zoo, there is an amusement park. So, at the Belgrade Fortress you can have fun all day long, and you can engage in various kinds of activities. Or, you can just enjoy walking around. No charge for that.
In the lower part you can find Kula Nebojša ("Dardevil Tower"), two orthodox churches of St. Petka and Ružica, and the Belgrade Planetarium. There is also a night club at the open, called "Barutana", after an old Turkish ammunition depot.
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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