The U.S. National Library of Medicine is indeed a fallout shelter, created during the Cuban Missile Crisis, not to protect its employees, but to protect the books. In fact, the library is constructed such that if Washington D. C. were ground zero for a nulclear blast, the second floor of the library would cave in. The stacks would remain undamaged, protected by a 100-foot concrete barrier.
The second floor contains all the offices of the personnel department.
Ha. A fitting end to red tape and collective ineptitude. :)