'Amphitheater' in the Bible

Then the city was filled with confusion; and people rushed together [as a group] into the amphitheater, dragging along with them Gaius and Aristarchus, Macedonians who were Paul’s traveling companions.

For, I think, God has exhibited us apostles at the end of the line, like men sentenced to death [and paraded as prisoners in a procession], because we have become a spectacle to the world [a show in the world’s amphitheater], both to angels and to men.