The Northrop facility is known as "The Tejon Ranch" and is sometimes referred to as "The Tehachapi Ranch" by UFO researchers.
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There are large radar or microwave dishes and strange looking pylons to which objects can be fixed, for the purpose of beaming electromagnetic radiation at them. These pylons rise up from underground out of diamond-shaped openings in the middle of long, paved surfaces that resemble aircraft runways, but which are not used by any type of aircraft for landing or take-off.
It is thought that this facility goes down as many as 42 levels, and that tunnels link it to other nearby underground installations in the area.
its not as mysterious as you think. read this page and related links.
http://www.anomalies.net/object/io_1174412218386.html
http://www.flightglobal.com/blogs/the-dewline/2009/06/the-aircraft-that-could-have-m.html
I've talked to people that were there during the construction and it'd curl your hair!
I could go on here...
There WAS a MacDonald Douglas facility that was very similar to the east of Northrop near the "town" of Llano. That appears to have been shut down. Been there several times.
One location that I've not visited, was Lockheed's Helendale facility with a similar setup.
I have a lot of personal in fo on the first two.