Which architectural structure in Rome is idolized as a prime example of Roman architecture?

The Pantheon is widely regarded as a quintessential example of Roman architecture due to its remarkable design and engineering feats. Built during the reign of Emperor Hadrian, the Pantheon exemplifies the innovative use of concrete, allowing for the creation of its vast dome, which remains the largest unsupported concrete dome in the world to this day. The symmetrical rotunda and the coffered ceiling not only showcase aesthetic beauty but also demonstrate the Romans' advanced understanding of structural engineering.

Additionally, the oculus at the dome's apex serves as both a source of natural light and a symbolic connection to the divine, enhancing the spiritual experience of the space. The harmonious proportions and the use of classical orders throughout the facade further affirm the Pantheon’s role in epitomizing Roman architectural principles, blending form and function in a way that has influenced countless structures throughout history. Its preserved state and continual use as a church highlight its enduring significance and impact in both architectural and cultural contexts.