Hauntingly beautiful, this ancient theater was built in AD 160 by the affluent Herodes Atticus in memory of his wife, Regilla. Known as the Irodion by Athenians, it is nestled Greek-style into the hillside, but with typically Roman arches in its three-story stage building and barrel-vaulted entrances. The circular orchestra has now become a semicircle, and the long-vanished cedar roof probably covered only the stage and dressing rooms, not the 34 rows of seats. The theater, which holds 5,000, was restored and reopened in 1955 for the Athens and Epidaurus Festival. To enter you must hold a ticket to one of the summer performances, which range from the Royal Ballet to ancient tragedies usually performed in modern Greek. Contact the Festival's box office for ticket information. Children under 6 are not allowed except at some special performances.