St. Peter's Basilica in Vatican City, the largest church in the world.
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According to the Catholic Encyclopedia the Cenacle (the site of the Last Supper) in Jerusalem was the first Christian church. The Dura-Europos church in Syria is the oldest surviving church building in the world, while the archaeological remains of both the Aqaba Church and the Megiddo church have been considered to ...
Ephesus, Smyrna, Pergamos, Thyatira, Sardis, Philadelphia, and Laodicea were literal churches that existed in Asia Minor (modern Turkey) during the first century A.D. Named for their geographical locations, the churches were strategically located along a major Roman road. 1.