Roman Empire Interactive Road Map

Stanford University has just published ORBIS - The Stanford Geospatial Network Model of the Roman World, an online map of the Roman world, which lets users find travel routes between different locations around the Mediterranean. The tool finds the fastest route on land and sea, as well as its travel time. There are various options, including month of the year, travel type (private on horseback, army, by land only, etc...), and cost. It's definitely worth a look!