Greek amphitheaters were large, open-air venues built in ancient Greece for performances, particularly of tragedies and comedies. They were typically constructed on hillsides, allowing for excellent acoustics and visibility. The design featured a circular or semi-circular seating area called the theatron, which could accommodate thousands of spectators. These structures often included a central performance area known as the orchestra and a backdrop called the skene. Famous examples include the Theater of Epidaurus and the Theater of Dionysus in Athens. Greek amphitheaters played a crucial role in the cultural and social life of ancient Greek society.