The archaeological site of Felix Romuliana - Gamzigrad is part of the National Museum of Zaječar and since 2007 it has been included in the UNESCO list of world cultural heritage.

Felix Romuliana represents the residence of Roman emperor Gaius Valerius Maximilian Galerius, who named it after his mother Romuliana. It is assumed that the palace was never completed, and the emperors of the 4th century left this magnificent property to the Christian church. During the 5th century the palace was destroyed by barbarians, and in the 6th century Justinian I rebuilt it as a border fortress.