You may want to take a look at BPB # 9 ,,,, approaching the green there seems to be 2 structures. A faint 1 behind the green and a regular one to the right of the green. However when on the green facing the back of the green,,, 12:00 position the faint one is now gone.
This may just be Dr. Who's Tardis, making a brief pit stop, or someting more maniacle. Beware. This might warrent some of your proprietory instrumentational devices to uncover the real intentions out here.
Pee
Maybe someone that knows how to capture screen shots can post them. I do not possess this technique.