http://www.hiddenpassageway.com/
When times are tough, just pull out your book and retire to your secret room!
(http://vger.homeip.net/images/batman-what.GIF)
Sweet! You could have your own Hall of Danger, Chamber of Solitute, a Secret Overlord Throne Room, or even just the cliche Hidden Treasure Room.
Maybe there should be a warning not to store actual magical items, arrows, secret maps, or Hello Kitty diaries rife with secrets in there. Intrepid adventurers have ways of getting into places when things like that are in there.