We left my parents' home early and made good enough time that when we reached Chicago I asked the kids if they wanted to stop somewhere and add to our collection. The choices were the Willis Tower (which I still think of as the Sears Tower) and the Lincoln Park Zoo, both of which have two Mold-A-Ramas. The kids weren't sure which to do, so I got to pick. The Sky Deck at the Willis Tower is expensive, and the Zoo was free (or would have been if I'd known a better place to park), but the deciding factor for me was the weather. It was a gorgeous fall day and too perfect to spend inside.
The park is beautiful. It's the kind of place that makes you wish you were living in Chicago so you can take walks there whenever you like and enjoy all the wonderful things the city has to offer. (Then you get in the car and decide, no no, plenty fine in Milwaukee where we aren't trapped in perpetual rush hour.)
There are two Mold-A-Rama machines in the Lincoln Park Zoo: One in the primate house, and one in the main barn. The first one we found quickly. It's a gorilla just like the one we got from our own zoo, but this one is green. The second was at the far end of the park and it's an orange piggy-bank, which is sort of odd, but at least it's one we'd never seen before.