The **Colosseum**, an iconic amphitheater in Rome, is considered one of the greatest achievements of the Roman Empire. Completed around AD 80, this architectural marvel could accommodate tens of thousands of spectators, showcasing the Empire's engineering prowess. The Colosseum was used for various public spectacles, including gladiatorial contests, animal hunts, and mock sea battles. It symbolized the grandeur of Roman entertainment and society's values, as well as the Empire's expansion and power. Today, the Colosseum remains a significant cultural and historical symbol, attracting millions of visitors yearly.