Mapping The Might Have Been
The moment you make a map there's a fairly good chance that it will be out of date. There's nothing wrong with this; anyone who works in the cartography or mapping fields will tell you that one of the biggest challenges in making maps is not making the map, it's keeping it up to date once it's made. Geography is constantly moving, changing, flowing thing.
One of the most fascinating aspects of old maps is not so much looking at what's changed since they were made, though that is fascinating enough, but of what might have been but then never was.
Regular readers of this blog may have worked out that out of all the maps there are, my favourite is the London Underground Tube map. A browse through the London Tube Map Archive shows just how much the Tube network has expanded and contracted over the years and how stations have changed not only in name but sometimes in position as well. But some of these maps also show what was planned but which was never realised; as Trent Reznor once put it "all the what abouts, the might have and could have beens". Take a look at this map of the network from 1938.