"Pergamon and Its Multi-layered Cultural Landscape", the only capital city from the Hellenistic period, inholding the layers of Hellenistic, Roman, Eastern Roman and Ottoman periods have been inscribed to the World Heritage List of UNESCO in 2014.
The Areas, insribed to the World Heritage List consist of nine components; Pergamon City (multi-layered city), Kybele Sanctuary, Ilyas Tepe, Yigma Tepe, İkili Tumuli, Tavşan Tepe, X Tepe, A Tepe and Maltepe Tumulus. Ancient Pergamon settlement at the top of the Kale Hill, the capital of Hellenistic Attalid Dynasty, represents the outstanding example of urban planning of the Hellenistic period with its monumental architecture. Temple of Athena, the steepest theater of the Hellenistic period, library, Great Altar of Pergamon, Dionysus Temple, agora, gymnasiums and high pressured water pipe-line system are the most outstanding examples of this planning system and architecture in the period. Great Altar of Pergamon and many other works produced by Pergamon School of Sculpture represent the climax in the art of sculpture in Hellenistic period.