The residents of Europe mostly don't know that the birthplace of the old continent is believed to be Vinča, where an ancient civilisation rose at the edge of Belgrade, 7500 years ago, in the Neolithic period. At that time the first 'urban' settlement in Europe was formed. When we say 'urban we mean the one whose residents also practised trade and not just agriculture, a rather rare thing for the time. 

Ancient Singidunum was erected in the first century BC, and the oldest Christian monument is Jona's Sarcophagus, dating from the fourth century. The first car could be seen n the streets of Belgrade in 1903, and the Train station was built in 1884. During the course of history, there were more than 115 battles for Belgrade, moving it to the top of the list of the cities most fought for, and was completely destroyed and burnt between 30 and 40 times. More information about the city is offered at Belgrade Underground tours. 
Long ago, the Belgrade's reef was at the edge of the Pannonian Sea, more than 14 million years ago. The structure of the rocks from which Belgrade was made is the same as those of Vienna. These two cities were, each on their own side, on the borders of Pannonian Sea.