Whoa.... Awesome shot of such intriguing history. Some of that stuff looks really curious to me. Also, as funny as it might be to say the square in the circle might be a UFO/ship, I actually think it might be. As weird as this is, there was story that came out not too long ago about military and some fighter pilots who witnessed a UFO, and a pilot who got somewhat close enough to see it described it as a "sphere encasing a cube"... That's what appears to be what the centerpiece shows, however, there is like some kind of line sticking out at an angle it looks like in the bottom middle of it. I wonder what that is and also what the symbols are to the top left of it? One of them looks like a star. There also appears to be one on the opposite side as well and some lines on the inside of the square.
Weird, cool stuff! I wish I knew what it meant! Thanks for sharing!