Temple of Trajan. Trajan started it but after his death Emperor Hadrian (117-138) finished the temple in Corinthian order and it was placed upon a terrace with dimensions of 68 × 58 m (223.10 ft × 190.29 ft). Attempts have been continuing by the German archaeologists since 1976 to erect this temple which has 6 x 9 columns and a peripteros plan (one row of columns around the temple). It is completely marble.
The Theater of Pergamon, one of the steepest theaters in the world, has a capacity of 10,000 people and was constructed in the 3rd century BC. The theater underwent changes during the Roman period under the reign of Caracalla. There is a 246.5 m (808.73 ft) long and approximately 16 m (52.49 ft) wide stoa (portico) in front of the theater. The road in front of the theater leads to the Temple of Dionysos (known in Rome as Baccus, god of wine). The temple was constructed in the 2nd century BC and reconstructed in marble during Caracalla's period (211-217 AD). Its dimensions are 11.80 × 20.22 m (38.71 ft × 66.34 ft). The temple, which arouses interest because of the staircase in front with a height of 4.5 m (14.76 ft) and 25 steps, has an exquisite appearance.
The famous Altar of Zeus in Pergamon is on the south of the theater. Eumenes II (197-159 BC) constructed it as a memorial of the victory against the Galatians. This Altar has the shape of a horseshoe and its dimensions are 36.44 × 34.20 m (119.55 ft × 112.20 ft). It is composed of four parts and the high relieves on it describe the war between the giants and the gods. The Altar which was taken away from Pergamon in 1871 and carried to Germany by the German engineer Carl Humann, is exhibited at the Museum of Pergamum in Berlin, in a manner conforming to its original. Today the Turkish government is trying to get it back from Germany bringing the issue to the International Court of Justice in The Hague. On the south of the Altar, the Agora (market place) belonging to the 2nd century BC, is
