We returned to Joliet for my high school band's Centennial Celebration. We visited the museum because their new display du jour (or for about a year maybe) covered the band's 100 years. That display was very good.
Beyond that, we were very pleasantly surprised at the coverage of the history of Joliet from the discovery days through developments of transportation, industry, culture and everyday life. Some displays included sound and some had movies with actors giving individual commentary and reminiscences.
A short (12 min?) movie provided a good introduction.
I grew up there in the 50s and 60s and have visited a number of times since, but there were a lot of things that I never knew about.
If you're at all interested in the development of an interesting small city with diversity in background and population, I recommend a visit.