Ruins, which are found on Gün Mountain, located 2 km away from the south of Yuntdağı köseler village of Yunusemre District, has shown that the region is the Aigai region, which is one of the 12 Aeolian cities Herodotus has mentioned.
Establishment date of the city, the first information about which was found in the 5th century BC when the famous historian Herodotus has lived, is not known for certain. Aigai, which had had a small castle-town identity until the beginning of the 3rd century B.C., has developed during the Hellenistic Period and had public structures which are indispensable for a Hellenistic city. The most important structures of the city that are worth seeing are the 3-floored Agora and Public Assembly Building . Aigai has needed rainwater during its life time, and all streets and alleys were paved, and the sublayers of stone pavements were furnished with a sewer system which led rainwater to hundreds of reservoirs of various sizes. Flat areas are formed with high terrace walls at the hills of the city looking to the West and the South, and public structures such as the Theater, Gymnasium, Baths and the Stadium were built on these flat areas. Some parts of the walls surrounding the city are standing still today. Agora, Theater, Stadium, Assembly Building and Temple ruins are in apparent condition.