In the category of odd things you must see, I present... The House on the Rock. Located in Spring Green, Wisconsin, H and I took the tour with my mother a few years ago. Designed and built (begun in the early 1940s) by Alex Jordan of Madison, WI this is actually a complex of rooms, streets, buildings and gardens covering acres of land. I did not realize at the time, but discovered in checking out their web presence that there is actually an Inn and resort to stay at as well.
The top photo is an outdoor shot of "The Infinity Room"... truly a sight to see as it juts out 218 feet over the valley (unsupported) and has 3,264 windows for walls. Much of the rest of the house contains the various collections of Mr. Jordan, including items such as the world's largest carousel, antique guns, dolls, mechanical banks, areas devoted to aviation, nostalgia, a nautical theme (including a Titanic display, and this creature below...) and much more. It is an attraction that at times defies description. But if you find yourself in Wisconsin, I encourage you to swing through!