Pergamon
Pergamon lies on the north edge of the Caicus plain in the historic region of Mysia in the northwest of Turkey. The Caicus river breaks through the surrounding mountains and hills at this point and flows in a wide arc to the southwest. At the foot of the mountain range to the north, between the rivers Selinus and Cetius, there is the massif of Pergamon which rises 335 metres above sea level. The site is only 26 km from the sea, but the Caicus plain is not open to the sea, since the way is blocked by the Karadağ massif. As a result, the area has a strongly inland character. In Hellenistic times, the town of Elaia at the mouth of the Caicus served as the port of Pergamon. The climate is Mediterranean with a dry period from May to August, as is common along the west coast of Asia Minor.
Pergamon
The well-preserved Theatre dates from the Hellenistic period and had space for around 10,000 people, in 78 rows of seats. At a height of 36 metres, it is the steepest of all ancient theatres. The seating area ("koilon") is divided horizontally by two walkways, called "diazomata", and vertically by 0.75 metre wide stairways into seven sections in the lowest part of the theatre and six in the middle and upper sections. Below the theatre is a 247 metre long and up to 17.4 metre wide terrace, which rested on a high retaining wall and was framed on the long side by a stoa. Coming from the Upper market, one could enter this from a tower-building at the south end. This terrace had no space for the circular orchestra which was normal in a Greek theatre, so only a wooden stage building was built which could be taken down when there was no performance taking place. Thus, the view along the terrace to the Temple of Dionysos at the northern end was unimpeded. A marble stage building was only built in the 1st century BC. Additional theatres were built in the Roman period, one in the Roman new city and the other in the sanctuary of Asclepius.