The structure that is an enduring symbol of ancient Rome and its architecture, located in the city center, is the Colosseum. This iconic amphitheater, completed in AD 80, was used for various public spectacles, including gladiatorial contests and mock sea battles. It exemplifies Roman engineering prowess with its intricate design, able to accommodate around 50,000 spectators. The Colosseum remains a vital tourist attraction and symbolizes the strength and grandeur of the Roman Empire. Its ruins reflect both the cultural significance and the historical narrative of ancient Rome.