An amphitheatre or amphitheater is an open-air venue used for entertainment, performances, and sports. The term derives from the ancient Greek ἀμφιθέατρον, from ἀμφί, meaning "on both sides" or "around" and θέατρον, meaning "place for viewing".
The Colosseum, an amphitheatre in Rome (built 72–80 AD)
Arles Amphitheatre, France: a Roman arena still used for bullfighting, plays and summer concerts.
Pula Arena, Croatia
Aerial photograph of the Hollywood Bowl, showing the seating after the 2005 renovation.
A theater, or playhouse, is a structure where theatrical works, performing arts, and musical concerts are presented. The theater building serves to define the performance and audience spaces. The facility usually is organized to provide support areas for performers, the technical crew and the audience members, as well as the stage where the performance takes place.
The interior of the Palais Garnier, an opera house, showing the stage and auditorium, the latter including the floor seats and the opera boxes above
An opera production of Ihitai 'Avei'a – Star Navigator at a 'block box' events centre in Auckland, New Zealand
Backstage area of the Vienna State Opera
Maryland Theatre in Hagerstown, Maryland, showing the stage, proscenium and seating
