MyDrunkAccount

Kinda just looks like a training track to me, for driving. Probably not for the average driver but for cops, body guards, etc.You've got three lane roads, circular tracks, zig-zags, and they're all connected by pavement...but I do admit, it is pretty big and seems to be out in the middle of nowhere.

Shlomo_Shekelberg

I've read about this stuff before. They're used for calibrating and focusing spy satellites correctly. America has similar pictographs and shapes out in the middle of nowhere used for the same purpose.

Ulluses

Not just spy satellites, also weather and climate monitoring equipment along with systems that track airplane locations.

Source: Worked at a plane manufacturer as a programmer, had pictures like this on the walls and talked to the guys who used them. They've been around for years.