Unknown Symbols and Structures in China

A series of lines, symbols, roads, and structures in Northern China, near the Mongolian border, have been spotted through the use of Google Maps. They are near where China performs it's space operations, nuclear program, and some of it's most top secret military maneuvers.

The Telegraph was nice enough to link to the Google Maps location of some of them, and they are there. However the others weren't clearly marked, so not so easily found.

It is completely unknown what purpose they serve. The location would definitely suggest that it has some sort of military application. But as they are unrecognizable, everything is just guesses at this point.

Some were clearly built up, in some form or another, by the shadows the pictures show. Others you can't tell if area's were painted or just bulldozed flat.