It had a cedar roof
The theatre was originally roofed with cedar timber, which made it a true odeon, a hall for music. The roof is long gone; performances now take place under the open sky.
Herodes Atticus finished this stone theatre in AD 161 in memory of his wife, Regilla. Ruined in AD 267 and restored in the 1950s, it hosts concerts again every summer. Here's what you're looking at, and what to listen for from the path above it.

The theatre was originally roofed with cedar timber, which made it a true odeon, a hall for music. The roof is long gone; performances now take place under the open sky.
In AD 267 the Heruli, a Germanic people, sacked Athens and left the Odeon in ruins for centuries. Its seats and stage were rebuilt in Pentelic marble in the 1950s.
It has been the main stage of the Athens Festival since the 1950s. Maria Callas sang here in 1957, Frank Sinatra in 1962, and Luciano Pavarotti performed here twice.
Only during performances. You can see it from above on the path up to the Acropolis.
It was completed in AD 161 by Herodes Atticus, a wealthy Athenian, in memory of his wife Aspasia Annia Regilla.
About 5,000 spectators.