they are all in the surrounding areas of area 51.
you don't think those things are a little weird?
did you look at some of the other crazy shit around there?
heres one
http://maps.google.com/maps?ll=37.41...0557&t=k&hl=en
http://maps.google.com/maps?ll=37.20...4457&t=k&hl=en
I'd love to know what these are
http://maps.google.com/maps?ll=37.91...2229&t=k&hl=en