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.
Bergama
Located on a promontory north of the Bakırçay river, inland from the Aegean Sea, Bergama has a population of about 102,000. The ruins of the ancient city of Pergamon lie to the north and west of the modern city; Roman Pergamon is believed to have sustained a population of approximately 150,000 at its height in the 1st century AD.