Next time you’re walking through Chicago’s Loop, make your way over to the corner of Randolph and State Streets. If you look up, you’ll see a high-rise that houses both apartments and retail stores, called “Block 37.”
Now look down. If somehow you could see through the sidewalk below, you would see that you’re standing atop a vast underground government structure, which is roughly the size of a football field.
NBC 5 Investigates first revealed the details of this mysterious structure in this story, which we reported on nearly a decade ago:…