Pergamon
Pergamon's other notable structure is the great temple of the Egyptian gods Isis and/or Serapis, known today as the "Red Basilica" (or "Kızıl Avlu" in Turkish), about south of the Acropolis at (39 7' 19" N, 27 11' 1" E). It consists of a main building and two round towers within an enormous "temenos" or sacred area. The temple towers flanking the main building had courtyards with pools used for ablutions at each end, flanked by stoas on three sides. The forecourt of the Temple of Isis/Sarapis is still supported by the Pergamon Bridge, the largest bridge substruction of antiquity.
Library of Pergamum
Under the rule of Eumenes II (197-160) Pergamum was a wealthy, developing city with a population of over 200,000 people. Culturally it was rivaled only by the cities of Alexandria and Antioch. Many important works of sculpture and architecture were produced at this time, including the Great Altar of Pergamon. Upon the death of Attalus III, son of Eumenes II, in 133 BC, Pergamum was bequeathed to the Roman Republic. After the fall of Constantinople, Pergamum became part of the Ottoman Empire.