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
The city gradually declined during Late Antiquity, and its settled core contracted to the acropolis, which was fortified by Emperor Constans II (). In AD 663/4, Pergamon was captured by raiding Arabs for the first time. As a result of this ongoing threat, the area of settlement retracted to the citadel, which was protected by a 6-meter thick wall, built of spolia.