When I read a couple of bloggers' accounts of their journeys along the Underground Railroad route, I learned that the route through Alabama is pretty but not too hilly. Then, traveling through the foothills of Tennessee and Kentucky becomes a bit of a hilly grind. Now that I have poured over the maps (great maps!), I can see these changes in topography. Each little map is accompanied by a profile view of the elevation changes. Check these out.
Below is a profile view of about 29 miles in Tennessee. Doesn't this look intimidating? Both the uphills and downs look steep enough to fall off.
By contrast, check out this 28-mile stretch in Kentucky, right along the Indiana border.