Vienna is the main and the largest city in Austria, divided into 23 districts. The city lies on the banks of the Danube, 40 km from the border with Slovakia and the Slovak capital Bratislava. Vienna has about 1.6 million inhabitants (one-fifth of the Austrian population). Symbol of Vienna is St. Stephen’s Cathedral, the seat of the Archbishop of Vienna, and a patron saint of the city is St. Leopold. The headquarters of several international organizations are located in Vienna: OPEC (Organization of Petroleum Exporting Countries), IAEA (International Atomic Energy Agency) and UNIDO (Industrial Development Organization of the United Nations).

Požarevac is a city and the administrative center of the Braničevo District in eastern Serbia. It is located between three rivers: Danube, Great Morava and Mlava.

The modern town of Požarevac was first mentioned in the 14th century under the name Puporače, it first being mentioned under its present-day name in 1476. Požarevac was the second capital of the Serbian prince, Miloš Obrenović with the first regular state court in Serbia being established here in 1821. Since 1878, Požarevac became part of the independent Principality of Serbia and since 1882 as part of the Kingdom of Serbia.

The National Museum in Belgrade and Požarevac has some 40,000 items found in Viminacium, of which over 700 are of gold and silver. Among them are many invaluable rarities. In June 2008, a Triballian (Thracian) grave was found with ceramics. These date from the first millennium BC.