Via kottke, this tube-map-style atlas of Roman roads lands foursquare in a gloriously tangled Venn intersection of Things I Really Love:

If that’s whetted your appetite, the Stanford ORBIS Geospatial Model of the Roman World will take you all the way down the rabbit-hole. Those with a more parochial bent may prefer the tube-map atlas of Roman roads in the British Isles. (There are more of them than you think.)