The National Geospatial Intelligence Agency, or NGA, is on ground that has been federal government property for more than 150 years. It is located in south St. Louis, right across the street from Anheuser-Busch. Today personnel there construct maps & charts in support of military operations. In the 1960's they helped map the moon for some of the Apollo missions. During the Civil War, NGA was the site of the St. Louis Union Arsenal. And for thousands of years prior to that, archeological evidence shows this spot was a strategic location in the middle of the continent for launching missions to the great unknown west of the Mississippi River.