What is the oldest surviving theater in the world?
Theatre of Dionysus
Alterations to the stage were made in the subsequent Hellenistic period, and 67 marble thrones were added around the periphery of the orchestra, inscribed with the names of the dignitaries that occupied them. The marble thrones that can be seen today in the theatre take the form of klismos chairs, and are thought to be Roman copies of earlier versions.[10] At the center of this row of seats was a grand marble throne reserved for the priest of Dionysus.