Greek theatres were large, open-air structures built in ancient Greece, primarily for the performance of tragedies and comedies. They were typically constructed on hillsides, allowing for natural acoustics and seating for thousands of spectators. The most famous theatre is the Theatre of Epidaurus, known for its exceptional sound quality and well-preserved architecture. The design of Greek theatres included a circular performance area called the orchestra, where actors performed, and a semi-circular seating area known as the theatron. Theatres often featured elaborate backdrops called skene, which enhanced the visual experience of the performances. These venues played a crucial role in the cultural and social life of ancient Greece.