An amphitheatre (alternatively amphitheater)'s an open-air venue for spectator sports, concerts, rallies, or theatrical performances. There're two similar, but distinct, types of structure for which the word 'amphitheatre''s 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… (More on Amphitheatre)