Follow the little blue line upwards from the structure and you'll see a dam clearly pumping water, and the canals extend up to around 50km.
The Map View also shows a large area around it as a huge lake, so I'm guessing they drained the lake. Still pretty impressive in my opinion.
or a little closer to home:
You want this: http://maps.google.com/maps?hl=en&ll=40.458148,93.393145
Owens lake has evaporative collection ponds that can be really bright red some times, the salt itself is pink:
Here is a quote from the thread:
"It is an optical test range for autonomous cruise missile targeting systems, to simulate the street grids of cities. If you check the scale of the grid on google earth (+40° 27' 6.89", +93° 44' 20.77") you'll notice that the grid is the size of several city blocks. If you look here (40.479272,93.47713) they have a fake airport painted out over ditches, creeks and inclines. There is also a paved runway short way away, with random bomb craters in it.
The round circle with the 3 jets in the middle is a blasting test range, used to test the dispersion, and effectiveness of explosions over a varying ranges." 
That being said, the old MX silos could be seen from space but they were pretty clearly revetments and launchers connected by rail lines. Generally large infrastructure often gives away its intent which is why modern despots prefer building everything underground.
The other ones looks like bombing sites.
For an example, see
From : "This Site was a Chinese missile test centre, and a lot of area is developed for tourists attraction. but some facility such as the fake runways are still under military control.
"1950s, this site was chose by Soviet scientists as the first Chinese nuclear weapon test site, but the Chinese authority refused this suggestion due to its small scale and location. and just used it as missile test facility."
Although, I'm not sure on the factuality of this statement, however has a link to a people.com.cn file about the area.
(A 1:20 scale model of the border between India and China? It's too small to train on directly, and it's too large to see all at once for higher-level planning.)
Could this just be a glitch in image processing? Otherwise, there are quite a bit of things going on around this area.
Dunno what that would indicate, but the results may be interesting...
http://maps.google.com/maps?hl=en&ll=40.49081,93.510867&... looks interesting as well.
http://maps.google.com/maps?hl=en&ll=40.45374,93.743119&... another similar looking grid further east.
Interesting idea, but I don't see why they'd then construct a huge set of roads to connect every vertex. Or why they'd drill that many drillholes in less than a square km.
A lot of the sites have been there over 5 years.
Some of the older imagery has inadequate imagery to tell.
Obviously. I like his thinking.
Couple of the pictures were clearly geology/mining related and one is a military training area. No biggies.
Maybe it's their version of NORAD underground?
@jacquesm: Maybe Santa is more Stallman-esque than we give him credit; perhaps he doesn't enjoy being tracked?
This is interesting too, though. Most likely it is a military installation similar to what exists in the US.