My first guess is they are underground bunkers of sorts
Which country were these and I'll go do research.....
edit on 11-5-2011 by bluemirage5 because: (no reason given)

No, I don't think so. There's no reason to design roads in a grid shape. It's highly inefficient.
but doesnt it look like the "grids"
are roads that either have been...
covered up with sand... or blurred out...