Planning a road trip from Pittsburgh area to Great Falls, Montana at the beginning of July. The first day we plan to stop in Chicago overnight to visit family. July 4th we will head west. I've heard there are 2 main routes to take, one through North Dakota and the other through South Dakota. I've also heard that the North Dakota route is shorter. Although we would like to be in Great Falls by the end of the week, we're open to seeing some landmarks along the way. So my question is this: which route has the most places to stop and see? I've never been farther west than Chicago by car so I'm not really familiar with most of the landmarks. If anyone could give me a list for both routes and what your recommendation would be, that would be great! We're not as much into historical landmarks as we are into the great "sights" and photo opportunities...but we're open to anything! Please let me know your ideas and TIA!