Screenshots from North Korea's nuclear test site and related facilities.
I took a spin through Google Earth and grabbed some screen caps. Check out the slideshow here. The coordinates of the testing site buildings are: 41°16'40.29"N 129°05'06.06"E
It doesn't look like much, but there ya go. There's some good information about Korea's nuke testing over at Global Security. And more information about digital maps of North Korea from The New York Times.