The Launch Complex 5/6 Spin Test Facility is located in the red circle. It is the site where the upperstages and payloads of all the Jupiter-C, Juno I and Juno II were prepared and spin balanced. I its also the site were final assembly and encapsulation of Rangers 3, 4, 5, 6 & 7 was performed as well as Mariners 1 & 2 and all the Lunar Orbiters.
Here are some photos after the construction of the facility in 1956.
https://www.flickr.com/gp/155900140@N02/j3ceyXNJQ0
These photos were obtained from the JPL archives (Courtesy NASA/JPL-Caltech)
I will be posting photos of the planetary missions in the appropriate forums. I will post the Juno Explorer and Pioneer missions here.
I would like some feedback on how Flickr works for this.