If you can't go to Washington DC
This like a Mini Washington Monument. It is visible from I-29 on the East side between exits 144 and 147.
It isn't easily accessible from the interstate though. To get to, take I-29 exit 143 (not 144) to go east on Industrial Road, then take the left on S. Louis Blvd to go north for about 2 miles.
It is more interesting if you read up before hand about Sergeant Floyd as well as how the landmark became a historical marker.