I lived in Chicago my first 30 years, an now in my 70's. Back often, but this was our first river cruise in 20 years. Great commentary- both entertaining, and informative. I'm pretty good on Chicago history, and still learned a number of things about the cities history. What was more fascinating was leaning about some of the engineering that went into many of the buildings. The huge water reservoir on top of one building that repositions itself to counteract the wind force on the building was the neatest,