Re: landing sites.
The landing areas of Apollo 15, 16 and 17 were seen from the Apollo spacacraft of the same mission and as well from the surface, we can see the areas are whiter than the rest of the surface (when they landed the LM's disturbed the dust (in fact, even the footsteps disturbed the dust) and it changed its albedo, but never left a crater.
What might be visible are the tracks left by the Rovers.
(they are long straight lines)
Raoul