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 80 m long and 55 m wide 'Lower Agora' was built under Eumenes II and was not significantly altered until Late Antiquity. As with the Upper Agora, the rectangular form of the agora was adapted to the steep terrain. The construction consisted in total of three levels. Of these the Upper Level and the 'Main Level' opened onto a central courtyard. On the lower level there were rooms only on the south and east sides because of the slope of the land, which led through a colonnade to the exterior of the space. The whole market area extended over two levels with a large columned hall in the centre, which contained small shop spaces and miscellaneous rooms.