Greek Theatre: Theatre buildings were called a theatron.
The theaters were large, open-air structures constructed on the slopes of hills.
They consisted of three main elements: the orchestra, the skene, and the audience.
Orchestra: A large circular or rectangular area at the center part of the theatre, where the play, dance, religious rites, acting used to take place. Rising from the circle of the orchestra was the audience. The theatres were originally built on a very large scale to accommodate the large number of people on stage, as well as the large number of people in the audience, up to fourteen thousand.
Skene: A large rectangular building situated behind the orchestra, used as a backstage. Actors could change their costumes and masks. Earlier the skene was a tent or hut, later it became a permanent stone structure. These structures were sometimes painted to serve as backdrops.
Acting: The cast of a Greek play in the Dionysia was comprised of amateurs, not professionals (all male). Ancient Greek actors had to gesture grandly so that the entire audience could see and hear the story. However most Greek theatres were cleverly constructed to transmit even the smallest sound to any seat.
Costumes and Masks: The actors were so far away from the audience that without the aid of exaggerated costumes and masks. The masks were made of linen or cork, so none have survived. Tragic masks carried mournful or pained expressions, while comic masks were smiling or leering. The shape of the mask amplified the actor's voice, making his words easier for the audience to hear.