06/18/2026
For nearly 2,000 years, visitors have walked between these columns on their way into one of the most remarkable buildings ever constructed.
The Pantheon was completed around 126 AD and remains the world’s largest unreinforced concrete dome. Even more impressive, the dome’s diameter and its height from the floor are nearly identical, creating a perfectly balanced sphere within the structure.
Ancient Roman engineers accomplished this without modern machinery, proving that great art and great engineering often go hand in hand.
What do you think is the most impressive ancient building still standing today?