Lights out
Image: NASA Visible Earth
Put together by: fbjon

Earth at night
Image credit: NASA Visible Earth
http://visibleearth.nasa.gov/view_rec.php?vev1id=5826

Presumed North Korean Nuke Test site
This is the indicated test site for a North Korean nuclear weapon as described at GlobalSecurity, with satellite imagery.
You can see some buildings and a possible tunnel. This placemark was found on the Keyhole forums.
More info on Wikipedia.