Nymphaeum, or the Monumental Fountain, is a stunning old structure at the entrance of the ancient city of Side. It is 35 metres wide and 5 metres long and was once the personification of eminence in the country. The Nymphaeum has marvellous architecture, consisting of a three-story facade filled with statues, frescoes, marble work, niches and Corinthian columns.
The water for the fountain used to come from the nearby River Manavgat. The pool is enclosed by a parapet wall with inscriptions of mythological scenes. Most of these scenes link to the city's famous festival called Epibaterios. The procession for the festival would always begin at the Nymphaeum since it was at the city's entrance. Built during the rule of Emperor Vespasian in the 2nd century, it has been taken great care of to be preserved and well maintained until today.