The Oshkosh Public Museum is in a gorgeous historical home.
We went recently to see the Titanic exhibit. We went on Sunday (not smart--super long lines) however, the exhibit was great--it was so neat to see things from the Titanic.
Last summer's Pirate exhibit was awesome--the kids loved it--they had Pirate costumes, hands on things for children--stuff so smell--some good and some very bad!
My son still talks about that--they do a good job!