Ever heard about people going over Niagara Falls in a barrel? Good thing no one ever tried that on this particular river, however.
Here is a picture of Devil's Kettle Falls, which has to be one of the stranger waterfalls I've seen over the years. At the top, the river splits into two streams, with the right half falling down onto the rocks below, and the left half pouring into a rock cauldron of some sort. Apparently, the local DNR has been unable to figure out where the water goes once it enters the chamber. Logs and dye have been dropped into it but no one has been able to figure out where the water goes from there. Perhaps into an underground cavern or a lake?
One thing I learned on our past road trip is this: the number of rivers pouring into Lake Superior (including this one) is amazing. By looking at various websites, I've cobbled together a good two dozen rivers or more just on the Minnesota side alone, and many of them have waterfalls. Many of the falls are impressive, although this time of year the water levels looked quite low, but I'm sure in the spring with the runoff it would be more spectacular.
P.S. Sorry for the brevity of this post, but I've been busy with book cover design and working to release a short story by this weekend. Additionally, by October 1st, I'll release an entire short story collection.