This photo instantly provokes a ton of questions in me:
It shows the Dynamic Test Stand at Marshall SFC with the Enterprise, which was a Space Shuttle test vehicle, suspended for vibration testing. It was built to test the Saturn V in the same way. From the explanation below the image in an old NASA image of the day article, they were far from done getting things ready in this photo. They attached the external tank and the boosters too, and tested the whole thing.
Okay. The few articles I can find on this building are quite short and vague. Apparently it is the tallest building in Alabama, and is a national historic site (duh). But how did it work?
Was the rocket suspended for the test? If not, why would the rockets be placed in the building that way? How do you shake an entire rocket in a way that imitates vibration during launch? Do you have to put something in the fuel tanks to make it a proper test? How do you assess the results? Are all rockets tested this way?
Why are there only a few stub articles about the facility that don't answer anything about how it works in the first two pages of results on Google, after which the results get even vaguer? Okay, I don't expect an answer to that, and yet it sort of amazes me. My head is spinning with questions.