Pergamon was one of the seven churches to which the Revelator addresses his apocalypse.  Revelation 1:10 I was in the spirith on the Lord's day, and I heard behind me a loud voice like a trumpet 11saying, "Write in a book what you see and send it to the seven churches, to Ephesus, to Smyrna, to Pergamum, to Thyatira, to Sardis, to Philadelphia, and to Laodicea."

Reconstituted temple (with fragments) of Pergamon in Pergamon Museum, Berlin.
Fragments of a Greek woman and a citadel in Pergamon, Pergamon Museum.

Roman Mosaics from Pergamon