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 Altar
The altar lost its function at the latest in Late Antiquity, when Christianity replaced and suppressed polytheistic religions. In the 7th century the acropolis of Pergamon was strongly fortified as a defense against the Arabs. In the process the Pergamon Altar, among other structures, was partially destroyed in order to reuse the building material. The city was nevertheless defeated in 716 by the Arabs, who temporarily occupied it before abandoning it as unimportant. It was only resettled in the 12th century. In the 13th century Pergamon fell to the Turks.