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.
Metropolis of Pergamon
In February 1922, while most of the region was part of the Greek-controlled Smyrna Zone, the metropolis of Pergamon and Adramyttium was established as part of the general reforms in local religious administration. However, following the developments of the Greco-Turkish War of 1919–1922 and the subsequent population exchange between Greece and Turkey, the remaining Orthodox population was forced to leave the area.