Rome - Visualizing Imperial Rome
The link address is: https://www.khanacademy.org/humanities/world-history/ancient-medieval/roman-empire-survey/v/a-tour-through-ancient-rome-in-320-c-e
The link address is: https://www.khanacademy.org/humanities/world-history/ancient-medieval/roman-empire-survey/v/a-tour-through-ancient-rome-in-320-c-e