@edgarblythe,
How do we know they are not artifacts of the camera or hoaxes of some kind?
I haven't had the time to look extremely closely yet, but some of those images look too precise to be laid out on uneven terrain. The "grid" for example seems perfect, but it seems to be laid over hills and mountains. In order for anything like that to appear perfect in a three dimensional environment, it would have to be viewed from above at a single location, and it would probably have to be laid out from the same vantage point.
I haven't looked at them in enough detail yet so maybe I'm missing something, but they seem "fishy" just from cursory appearance.
How reputable are the sources providing the images?
Can we look these things up on Google Earth ourselves in realtime? What are the ground coordinates for these things?