Pergamon Bridge
The Pergamon Bridge is a Roman substruction bridge over the Selinus river (modern "Bergama Çayı") in the ancient city of Pergamon (today Bergama), modern-day Turkey. The wide structure, the largest of its kind in antiquity, was designed during Hadrian's reign (AD 117–138) in order to form a passageway underneath a large court in front of the monumental "Red Basilica" temple complex. The two intact tubes, which consist of supporting walls covered with barrel vaults, still serve their purpose to this day.
Pergamon
For the altar's construction, the required flat area was skillfully created through terracing, in order to allow it to be oriented in relation to the neighbouring Temple of Athena. The base of the altar measured around 36 x 33 metres and was decorated on the outside with a detailed depiction in high relief of the Gigantomachy, the battle between the Olympian gods and the Giants. The frieze is 2.30 metres high and has a total length of 113 metres, making it the second longest frieze surviving from antiquity, after the Parthenon Frieze in Athens. A 20 metre wide staircase cut into the base on the western side leads up to the upper structure, which is surrounded by a colonnade, and consists of a colonnaded courtyard, separated from the staircase by a colonnade. The interior walls of this colonnade had a further frieze, depicting the life of Telephus, the son of Heracles and mythical founder of Pergamon. This frieze is around 1.60 metres high and thus is clearly smaller than the outer frieze.