I looked up the region on Google Earth and it seems to be the region roughly depicted on the picture below. I am not 100% convinced it is this patch, but it should be in the vicinity there given some topographic details.
There doesn’t seem anything much there besides mountains, there’s also very few roads and the like. You can have a look at pictures people took around that area on Panoramio.
Now there’s no permanent structure of this sort there, as it’s not visible on Google Earth. Given the terrain, it’s also very unlikely that such a structure ever existed (as mentioned in the comments). I think it’s much more likely that this is either a processing error or that it has been blanked out intentionally. Some governments require that satellite pictures obscure areas where there is sensitive (mostly military) equipment. It is a bit puzzling though, that this happened on a Lufthansa flight, afaik such requirements usually only apply for local companies.
There’s nothing like that in that general area, according to Google Maps, so I must conclude that it’s an artifact of the software.
There are some geometric crop fields that appear to be fallow in google maps. Perhaps opium poppies.
This area here, perhaps:
I’m not totally convinced, the white area in the map is conformal to the terrain but looks a bit too regular to be believable.
Credit:stackoverflow.com‘