Underground bunkers

I have heard it said that where there's smoke there has to be at least a little fire. The same can be said of some conspiracy theories. Where there are theories, there possibly may be some facts there, too. That's how I feel about a new theory I've just come across involving a hidden bunker under Chicago's O'Hare Airport. Something strange seems to be going on there.

This northern Illinois home was built during the Civil War, but now sadly sits vacant and has been that way for decades. Explorers discovered that it also was harboring a secret hidden bunker underneath.