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.
Pergamon
The upper terrace measured 150 x 70 metres square, making it the largest of the three terraces. It consisted of a courtyard surrounded by stoas and other structures, measuring roughly 36 x 74 metres. This complex is identified as a palaestra and had a theatre-shaped lecture hall beyond the northern stoa, which is probably of Roman date and a large banquet hall in the centre. Further rooms of uncertain function were accessible from the stoas. In the west was a south-facing Ionic antae temple, the central sanctuary of the gymnasium. The eastern area was replaced with a bath complex in Roman times. Further Roman baths were constructed to the west of the Ionic temple.