DanubeThe Danube (ˈdæn.juːb ; ) is the second-longest river in Europe, after the Volga in Russia. It flows through much of Central and Southeastern Europe, from the Black Forest into the Black Sea. A large and historically important river, it was once a frontier of the Roman Empire and today connects ten European countries, running through their territories or being a border. Originating in Germany, the Danube flows southeast for , passing through or bordering Austria, Slovakia, Hungary, Croatia, Serbia, Romania, Bulgaria, Moldova, and Ukraine.
Golubac FortressThe Golubac Fortress (Голубачки град or Golubački grad) was a medieval fortified town on the south side of the Danube River, downstream from the modern-day town of Golubac, Serbia. According to recent discoveries, the fortress, which was built during the 14th century by Medieval Serbian state, is split into three compounds which were built in stages. It has ten towers, most of which started square, and several of which received many-sided reinforcements with the advent of firearms. Towers were not connected for easier defense.
Lepenski VirLepenski Vir (Лепенски Вир, "Lepena Whirlpool"), located in Serbia, is an important archaeological site of the Mesolithic Iron Gates culture of the Balkans. The latest radiocarbon and AMS data suggests that the chronology of Lepenski Vir spans between 9500/7200–6000 BC. There is some disagreement about when the settlement and culture of Lepenski Vir began, but the latest data indicates that it was between 9500-7200 BC. The late Lepenski Vir (6300–6000 BC) architectural phase saw the development of unique trapezoidal buildings and monumental sculpture.
Trajan's BridgeTrajan's Bridge (Podul lui Traian; Трајанов мост), also called Bridge of Apollodorus over the Danube, was a Roman segmental arch bridge, the first bridge to be built over the lower Danube and one of the greatest achievements in Roman architecture. Though it was only functional for 165 years, it is often considered to have been the longest arch bridge in both total and span length for more than 1,000 years. The bridge was constructed in 105 AD by instruction of Emperor Trajan by architect Apollodorus of Damascus, from Damascus, Roman Syria, before his Second Dacian War to allow Roman troops to cross the river.
