An amphitheatre (alternatively amphitheater) is an open-air venue for spectator sports, concerts, rallies, or theatrical performances. There are two similar, but distinct, types of structure for which the word 'amphitheatre' is used: Ancient amphitheatres, built by the ancient Romans, were large central performance spaces surrounded by ascending seating, and were commonly used for spectator sports; these compare more closely to modern open-air stadia. They were given this name because their shaped resembled that of two theatres joined together. Modern amphitheatres (incorrectly so named, but the word has come to be used in this sense) are more typically used for theatrical or concert performances and typically feature a more traditionally theatrical-style stage with the audience only on one side, usually at an arc of less than a semicircle; these compare more closely to the theatres of ancient Greece, and have been more commonly built throughout history as performance spaces.

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