People often make the assumption that everyone was just roaming primitive hunter-gatherer cavemen chasing deer across the plains until one day somebody just happened to suggest "Hey, why don't we stop here, start some large-scale intensive agriculture, and build a city?"
That's beyond extremely unlikely.
People lived in villages sustained by horticulture, fishing, local hunting and gathering, and pastoral herding long before intensive agriculture. Probably at least 5,000-10,000 years before. They could certainly have built other things if they had a use for them, and would use them long enough to make it worthwhile. Those that migrated seasonally from one village to another, year after year, might have done so.
That's beyond extremely unlikely.
People lived in villages sustained by horticulture, fishing, local hunting and gathering, and pastoral herding long before intensive agriculture. Probably at least 5,000-10,000 years before. They could certainly have built other things if they had a use for them, and would use them long enough to make it worthwhile. Those that migrated seasonally from one village to another, year after year, might have done so.