I analyze the Pantheon, one of the most well-preserved buildings from antiquity, through time. I start with Agrippa's Pantheon, the original Pantheon that is no longer standing, which was built in 27 or 25 BC. What did it look like originally under Augustus? We then shift to the Pantheon that stands today, Hadrian-Trajan's Pantheon, which was completed around AD 125-128, and represents an example of an architectural revolution. Was it even a temple? We also look at the Pantheon's conversion to a church, which helps explain why it is so well preserved. My study aims for an understanding of the Pantheon in context of what it meant for the people of Rome, the empire, and modern day.