When a Facebook page or a Reddit page posts an interesting historical picture, a three-layer pattern emerges.
First we hear from people who have seen or visited the place, and may misremember the location or other details. (I’m often in this group.)
Then we hear from people who actually lived or worked there, or whose family lived or worked there. They know the location but don’t necessarily know the secrets.
Finally we hear from remodelers or plumbers who dug into the walls and floors. They know exactly where the secret rooms or strange treasures were hidden.
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When the picture is an old car or gadget, the same three groups appear. (1) Saw it. (2) Owned and drove it. (3) Repaired it or worked in the factory that made it. Again 3 knows the secrets.
Polistra's Mill 