Death Valley related, and I believe I mentioned this in the Death Valley thread as well:
http://www.badwater.com/
The official race guide:
http://www.adventurecorps.com/downloads ... acemag.pdf
All I can say is one word: psycho. Even if I could run that far, no way would I run that race. Near the end of the official guide is a list of the runners. Check out the ages of everyone.