I would highly recommend visiting the Colosseum, the Roman Forum, and the Pantheon. The Colosseum, an iconic symbol of Rome's power, was where gladiators fought for their lives. The Roman Forum was the political and social heart of the empire, and the Pantheon, with its magnificent dome, was a sacred temple and remains a marvel of architecture.
As a travel agent who has lived in Ancient Rome, recommend three historical sites that tourists must visit.