The Pantheon, a temple to the gods, was completed in A. The temple's dome is still the largest unreinforced concrete dome in the worl.
Interesting article on composition of that nearly-indestructible ancient Roman concrete history buffs love so much. But, pretty photo, too! - Roman Temple in Pozzuoli, Bay of Naples, Italy
The core of this thick Roman wall was filled by one of their greatest innovations: concrete.
I got: Byzantium Empire! Which Ancient Civilization Would You Rule?
Why has Roman concrete lasted so long?
Scientists Uncover the Chemical Secret Behind Roman Self-Healing Underwater Concrete