What was one of the oldest cities know

Question

 Has to be Heidi's Mesopotamia irrigation and Jericho 

Answer 1

What do you mean by "Has to be Heidi's Mesopotamia irrigation and Jericho" ?

 

Since it is widely believed that Mesopotamia, the land between the Tigris and Euphrates Rivers (i.e. the "fertile crescent"), was the "cradle of civilization," the answer is likely to be an ancient city in that region.