Soldier Field in Chicago is shown in the Clint Eastwood movie Flags of Our Fathers, about the heroic raising of the U.S. flag on Mount Suribachi on the Japanese island of Iwo Jima, and its aftermath. The stadium was the setting of a 1945 war-bond drive, and the scene set there is carefully-framed to omit the modern additions to the stadium.
Glad you liked it! It’s one of my favorite movies of the new century. Here’s our earlier thread on it: Limitless film (spoilers after OP)