Downhill from the Citadel and five minutes walk east from downtown, the Roman Theater is the most obvious and impressive relic of ancient Philadelphia.
The theater, which was built during the reign of Antonius Pius (138-161 CE), is cut into the northern side of a hill that once served as a necropolis—or graveyard. It is very similar in design to the amphitheater at Jerash, and can accommodate 6000 spectators. The theater is still used periodically for sporting and cultural events.
Two small museums are built into the foundations of the Roman theater. The Jordan Folklore Museum is in the right wing of the theater and displays a collection of items showing the traditional life of local people. At the other end of the theater stage, the Museum of Popular Traditions displays traditional Jordanian costumes, including fine embroidery and beautiful antique jewelry. It also houses several sixth-century mosaics from Madaba and Jerash.