Theater, Greek or Roman?

Talk about a Senior moment (well maybe it was a pre-Senior moment)! We have visited Greek theaters in Epidaurus, Dodóni, Delfi, Filipi, Athens (Herod Atticus Odeum, and Theatre of Dionysos, near the Acropolis), at Siracusa and Taormina, Sicily, and Ephesus, Turkey. And while I have identified photos of several of those, here is a photo that I do not recognize at all.

HELP?