You can't go to STL as a first time visitor without venturing to The Arch. The boys heard about the arch over and over during the weeks prior to our visit but they gasped when they finally laid eyes on it. In fact, about 20 miles out of STL, our eldest cried and screamed (he was extremely tired of being in the car for 14 hours - I didn't blame him) until we spotted the arch from the Illinois side.
The beautiful Mississippi River.
Our view from 630 feet.