"One of the world's most precious volumes starts a tour on Monday, in Norman, Okla. The  Folger Shakespeare Library in Washington, D.C., is sending out William Shakespeare's First Folio to all 50 states to mark the 400th anniversary of the bard's death. Published seven years after he died, the First Folio is the first printed collection of all of Shakespeare's plays."

"The Folger has 82 First Folios — the largest collection in the world. It's located several stairways down, in a rare manuscript vault. To reach them, you first have to get through a fire door ... (if a fire did threaten these priceless objects, it would be extinguished not with water — never water near priceless paper — but with a system that removes oxygen from the room)."

"A massive safe door comes next — so heavy it takes two burly guards to open it, and then yet another door, which triggers a bell to alert librarians that someone has entered. After that, there's yet another door and an elevator waaaay down to a vault that nearly spans the length of a city block, says Folger director Michael Witmore."