The James S. McDonnell Planetarium of the Saint Louis Science Center

Historical marker location:

5050 Oakland Avenue, Saint Louis, Missouri

( Marker is on Faulkner Drive, 0.1 miles south of Clayton Avenue, on the left when traveling south.)

Forest Park

The Missouri River is the longest river in North America, stretching for 2,341 miles from its source in Montana to its mouth in the Gulf of Mexico.