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Did You Know!

Illinois has one of the largest hidden underground tunnel systems in the United States—and most residents have no idea it exists.

Beneath parts of Chicago (and other older Illinois cities) lies a vast network of abandoned freight tunnels, originally built in the early 1900s to move coal, mail, and goods under city streets. These tunnels once powered buildings, delivered supplies, and even carried cash and valuables—completely unseen by the public above.

Why it’s surprising:
Some of these tunnels are still accessible today, stretching for miles, yet are sealed off and rarely discussed. A major flood in 1992 accidentally exposed parts of the system, revealing just how extensive—and forgotten—it had become.

It’s a hidden reminder that Illinois played a much bigger role in early American infrastructure and industrial innovation than most history books mention.