I gotta go with BlackSea princess on this one. Certainly the founding of Rome did not include enormous contributions by slave labor, but Caesar Augustus' boast, "I found it a city of brick and left it a city of marble" (1st century CE) refers to a vast building program that extended well beyond his reign and involved hundreds of thousands, if not millions, of Asian, European and African slaves. This would be the city we think of as Rome, the classical period, much of which one can see even today.
Mandi