InfoBunker Collocation Facility, Near Des Moines, Iowa: Built as a U.S. Air Force bunker that could survive a nuclear attack, this underground facility's only outward sign is the
communications tower left over from its military use, a parking lot and a few outbuildings, as shown in this photo by blogger Brian Tiemann, who took this
picture during his visit there. The rest is underground. It is shielded from electromagnetic pulses, features isolation pads to shield equipment from shocks,
stores enough diesel fuel for six days and 17,000 gallons of fresh water reserves.