The ancient ruins of Cedrae in the island of Saray, date back to the Hellenistic Roman era. What is known as the City Islands is comprised of Orta Island and Kucuk Island. The remains of the ramparts can be easily seen from the distance. The island took its name from the rumour that Cleopatra swam with the locals in a small bay at the northwest of the island. Furthermore, she was supposed to have entered the sea with Mark Anthony, the sands of which were transferred from Northern Africa via ships by Anthony which may be true as this type of sand is only seen in Egypt.

The remains of buildings surrounded by ramparts on the east of Saray island date back from the Roman and Hellenistic period, and the small amphitheatre is in the best condition. The Christian Basilica was constructed over the pedestals of the Apollo Temple, belonging to Dors. There is an Agora on the west of Saray with inscriptions suggesting that athletics festivals devoted to Apollo were organised in the region. There are Necropolis ruins at Kucuk Island, as well as column reliefs.

The Acropolis was built on an extremely steep hill, approached by a winding road ascending some 300m. In this uniquely designed city, religious, official, social and commercial buildings are all found side-by-side. The King of Pergamum is on the top of this hill, which has been inhabited since ancient times. There are also five cisterns and an arsenal on the hill. Below these buildings is the Temple of Athena, as well as the Library and the Temple of Trajan. The Altar of Zeus was carefully placed below these buildings on a terrace.

One of the steepest amphitheatres in the world is found here. The lowest section of the acropolis is the gymnasium and the Temple of Demeter. Because of the topographical location of the city and the course of the main street, all the buildings of the acropolis are line up in a north-south fashion, but the buildings all face west so that they can be seen from far away. The Altar of Zeus was not encircled with colonnades for the same reason. The Agora and Athena Temple also have an unobstructed view of the plain.