Forbidden Donut

Probably a meteorite or something like that.

The Richat Structure, a prominent circular feature in the Sahara desert of Mauritania near Ouadane, has attracted attention since the earliest space missions because it forms a conspicuous bull's-eye in the otherwise rather featureless expanse of the desert. Described by some as looking like an outsized ammonite in the desert, the structure, which has a diameter of almost 50 kilometres (30 miles), has become a landmark for space shuttle crews. Initially interpreted as a meteorite impact structure because of its high degree of circularity, it is now thought to be a symmetrical uplift (circular anticline or dome) that has been laid bare by erosion. Paleozoic quartzites form the resistant beds outline the structure.

I got this from Wikipedia about that circular feature.

Dunno what it is, but it's fucking huge and it looks awesome.

kinda of looks like an eye if you zoom out a bit

Now that's really cool.