Lake County, Illinois.
Located in Wauconda, this is one of your local museums that is based on giving folks an interactive experience. I will be writing about their Civil War High Tech exhibit in my Saw the Elephant Civil War Blog. Unfortunately it is not there any more, hopefully with the technology hands on part of it going to some other local museum.
The museum is set in the beautiful Lake Wood Forest Preserve.
Definitely a highlight for any roadie would be the Curt Teich postcard collection. This company was a major producer of post cards back in the 1900s and the collection was turned over in tact to the museum. Just the place to find what things looked like in the past.
Worth a Visit. --RoadDog