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.
Hellenistic art
Pergamon in particular is a characteristic example of Hellenistic architecture. Starting from a simple fortress located on the Acropolis, the various Attalid kings set up a colossal architectural complex. The buildings are fanned out around the Acropolis to take into account the nature of the terrain. The agora, located to the south on the lowest terrace, is bordered by galleries with colonnades (columns) or "stoai". It is the beginning of a street which crosses the entire Acropolis: it separates the administrative, political and military buildings on the east and top of the rock from the sanctuaries to the west, at mid-height, among which the most prominent is that which shelters the monumental Pergamon Altar, known as "of the twelve gods" or "of the gods and of the giants", one of the masterpieces of Greek sculpture. A colossal theatre, able to contain nearly 10,000 spectators, has benches embedded in the flanks of the hill.