Roman Theaters

The remains of at least 230 Roman amphitheatres have been found widely scattered around the area of the Roman Empire. These are large, circular or oval open-air venues with raised 360 degree seating and not to be confused with the more common theatres, which are semicircular structures. There are, however, a number of buildings that have had a combined use as both theatre and amphitheatre, particularly in western Europe.
--- Wikipedia ---