Roman theatres were large, open-air structures built for performances, including plays, music, and other entertainment. They typically featured a semi-circular seating area called the cavea, which allowed audiences to enjoy the show from various angles. The stage, known as the pulpitum, was elevated and often adorned with elaborate backdrops and decorations. These theatres were integral to Roman culture and social life, reflecting the importance of public entertainment. Many famous examples, such as the Theatre of Pompey and the Theatre of Marcellus, showcased advanced engineering techniques, including the use of arches and concrete, which allowed for larger and more durable constructions.