We are only five days out from New Horizon's fly by/fly over the plant Pluto (or dwarf planet, depending on whichever camp your in). This will be the closest look anyone has ever had of Pluto, and the images Horizon sends back will be very detailed.
As the craft has been approaching the guardian on the wall its already been taking snap shots and sending them home. A few of these dusty images have shown strange black markings on her surface, which have puzzled scientists. They will no doubt get their answer soon. I'm banking on ruined cities of some ancient, though lost, Burroughsian civilization.