Here's a link I found to a National Geographic documentary on the US's preparations for protecting our government officials in case of disaster. It's pretty interesting. Having read enough Tom Clancy and spy novels, it piqued my interest, and satisfied my curiosity on quite a few of the places. Having been in intelligence in the USAF mumble years ago, part of me hates to see this stuff documented and aired, even if most of the places are out of commission. I'm of the school of Keep It Secret Stupid, but, that's just me.