Hi Minnie,
I am about 250 miles from Walnut Grove. I have not been there but they do have a pretty good web site
www.walnutgrove.org the southwestern portion of Minnesota is more flat farmland and is similar to the plains states (Nebraska, Iowa, South Dakota). Duluth is in an area of more hilly and forested and right on Lake Superior. Hardwoods south and Boreal forest north. From what I hear, very similar to the woods of Maine.
Here is a web cam at the harbor entrance in Duluth.
Duluth Harbor Cam Because it is on 24/7 you might see nothing but the lights on the breakwall. But they have a time lapse version you can click on. If you check it often you might catch a frieghter inbound or outbound (hopefully not at the same time)

In the summer you might catch a glimpse of us on our sailboat!
And finally (for now) here are some photos around town:
Duluth Photos