This follows on a map story here.
Update : check out below how a new map, itiner-e, updated the Roman Roads view.
Update 2: speaking of malaria in second map, appended maps on trade routes that triggered the Black Plague in the 14th c. Mediterranean.
Not William Wilder's 1953 Gregory Peck & Audrey Hepburn flick (Wikipedia)! When drawing up a map of Apostolic Palestine for local Catholics, I ran across Ancient World Mapping Center (AWMC) at UNC-Chapel Hill. While their web app (ArcGIS Online) is a cool one-stop-shop for their rich data set - for ex. I cannot do point clustering (Comet Assistant) with my standard Argis Pro desktop license - I loaded, picked apart an re-sorted some of their data for some interesting insights.
