Roman architecture is quite possibly the most iconic aesthetic out there. The elegant archways and the sturdy columns are unmistakable. The empire lasted from 509 BC to about the 4th century AD but most of the surviving architecture is from after 100 AD.
Rome was also famous for its domes. They were the first to realize their potential strength and beauty. The Pantheon being a prime example of this testament to shear will.
They also mastered the art of the arch way. I have always been fascinated with the physics of both the arch and dome’s structural integrity. As well as the romance they both seem to ooze. They truly have stood the test of time.