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 sanctuary of Hera Basileia ('the Queen') lay north of the upper terrace of the gymnasium. Its structure sits on two parallel terraces, the south one about 107.4 metres above sea level and the north one about 109.8 metres above sea level. The Temple of Hera sat in the middle of the upper terrace, facing to the south, with a 6 metre wide exedra to the west and a building whose function is very unclear to the east. The two terraces were linked by a staircase of eleven steps around 7.5 metres wide, descending from the front of the temple.