The Nymphaeum Fountain in antic Side was built in I century A.D. in honor of the emperor Vespasian and his son Titus. It is opposite the main gate outside the fortress walls. In ancient times, the fountain was a monumental three-story structure. The structure was 35 meters long and 15 meters high. 

The fountain structure was divided into three sections decorated with three large niches.  A gutter was led up to each of the niches through which water flowed into the pool in front of the structure. Between the sections there were arched niches separated from each other by Corinthian columns. All surfaces of the fountain were faced with marble, with marble statues also installed in the niches.

Today the fountain has completely lost its magnificence. From three floors there remained only one. Fragments of Corinthian columns are now placed in front of the fountain where the pool once used to be.