I forget where I came across this (it’s been kicking around in my PC for a couple of years).
Anyway, it’s a map from 1862 showing how to get across the plains to the newly opening gold mining areas of the Colorado territory.
Here’s a much bigger version you can download.
What I thought was most cool about this was how large parts of the new state of Kansas, and the territory of Nebraska were marked as desert, or infertile. The pale of settlement at that point is just far northeastern Kansas and southeastern Nebraska. Although there is a rail line marked all the way out to Colorado, offering ranches for sale all along the Platte River.