The open-air theater was designed for large cultural activities at the site of medieval Kalemegdan Fortress,the oldest section of urban area of Belgrade. It has a seating capacity of 4'500, backstage facilities, two smaller theatres/auditoriums (350-400 people), retail spaces, restrooms, VIP lounge, and rehearsal areas. The basic mass of the building is cylindrical. The arena of the theater is primarily round in shape. The overlap of the sides of the round resulted in the location of some seating sections slightly off from the center. This helps to lighten up the effect of the centrality of the composition, by accentuating slightly oblong lines of sight.The arena concept of this building is a direct reference to what the architect perceived as old Greek and Roman theaters.