From the point of view of the military art the main gate of Side city is interesting. The gate is a system formed by semi-circular courtyard and two guarding towers, having 2 sections opening outside and inside of the city. Also in the other cities of the Pamphylia region ( like Perge, Sillyon ) the same gate model was used.
A monumental entrance with 2 arches was added to the gate in the form of two layers, presumably during the period of Pax Romana ( Roman Peace ). Both layers are made of the column groups formed by overlapping two Korinth style columns.
The reason for this addition was the decreasing the gateís military importance. Inside the semi-circular courtyard is decorated with the statues placed inside these niches and also with niches separated by two layers of columns.
On city walls of Side other gates were also found, which were buried under the sands, bur the formation plan of these are different from the main gate. Among these different gates the friezes decorating the south eastern gate are very interesting. With big difficulty the south eastern gate was taken out of the sands. The spoils taken from the enemies like helmet, sword and shield are described on these friezes and these are exhibited in Side Museum.
Also this gate has a protocol entrance with two arches. These provide entry to the protocol courtyard, during the Byzantine reign the ground of which was covered with mosaics.