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The great amphitheater in Rome that was built by Vespasian and Titus about A.D. 75-80: "The Colosseum is a four-storied complex of arches and arcades with 80 arches around the exterior."
Overall the Colosseum is 189 meters (620 feet) long and 156 meters (513 feet) across, and by far, it is the largest of the Roman amphitheaters that, despite centuries of vandalism, still stand.
Its present name was not used until the Middle Ages which is derived not from the amphitheater's dimensions but probably from the colossal statue of Nero that used to be nearby.
It should be remembered that the term Colosseum may also refer to other large arenas; such as, the Los Angeles Colosseum, etc.