Gamzigrad is an archaeological site, spa resort and UNESCO World Heritage Site of Serbia, located south of the Danube river, in the city of Zaječar. It is the location of the ancient Roman complex of palaces and temples Felix Romuliana, built by Emperor Galerius in Dacia Ripensis. The main area covers 10 acres (40,000 m2).

Zaječar is a city and the administrative center of the Zaječar District in eastern Serbia. According to the 2022 census, the city administrative area has a population of 48,621 inhabitants. Zaječar is widely known for its rock music festival Gitarijada and for the ZALET festival dedicated to contemporary art.