Chain of Rocks bridge used to be one of my favorite places to visit and ride the bridge across, back when I lived in Missouri. If I go to Missouri, on a vacation, I would definitely revisit this beautiful area. The Chain of Rocks bridge is across the Mississippi, connecting Missouri and Illinois. And, is a part of Route 66.
The Chain of Rocks bridge was built in 1929 and was actually used by automobile and other traffic. Today, it is a pedestrian and bicycle bridge. There is a lot of cool information here, in case you are interested in reading more about this bridge.