Free Admission Saturday from 10am to 5pm at Chicago Cultural Center - see INFO below. "It is hopeless for the occasional visitor to try to keep up with Chicago. She outgrows his prophecies faster than he can make them." - Mark Twain, 1883 Chicago was only 46 years old when Mark Twain wrote those words, but it had already grown more than 100-fold, from a small trading post at the mouth of the Chicago River into one of the nations largest cities, and it wasnt about to stop. Over the next 20 years, it would quadruple in population, amazing the rest of the world with its ability to repeatedly reinvent itself. More Info below.