Earlier quoted context omitted.
And as their wealth was staggering, they could afford to build 'strong' more than most ancient civilizations and most of the conquerors just were assimilated rather than wanting to tear it down to the dirt.
The Romans weren't any more significantly wealthier than other contemporary Old World civilizations/empires - China, Persia, or India, for example. Conquerors being assimilated is a common theme that runs across most of these civilizations as well. However, monumental buildings that survive invading armies just tend to be dismantled/repurposed by the locals for the building material over time. I suspect that part of…
There's absolutely nothing special about Roman monuments.