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Did You Know!

🏛️ Illinois has a secret underground city beneath Chicago—and it’s still in use.

Most people have no idea that Chicago sits on top of a 40-mile underground tunnel system, originally built in the early 1900s.
What makes it rarely known:

• It was designed to quietly move coal, mail, and freight under the city without disturbing street traffic.
• Parts of it are still used today for fiber-optic cables, utility lines, and emergency routes.
• In 1992, a forgotten tunnel accidentally caused a massive underground flood, filling basements across downtown.

It’s one of the country’s largest hidden municipal tunnels—and most Illinois residents have never heard of it.