The Flavian Amphitheater or Colosseum was an enormous structure, about 160 feet high and covering about 6 acres. It had a removable awning to provide some shade for spectators.
Colosseum
The Flavian Amphitheater
Named for the family of the emperors who built it, the Flavian Amphitheater became known as the Colosseum possibly because of its proximity to a colossal statue of Nero.
Coliseum
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