Hidden Room

http://homesteadsurvival.blogspot.com/2012/06/sometimes-hidden-door-or-bookcases-is.html

Sometimes a hidden door or bookcases is used to disguise a safe or a panic room where residents can hide in an emergency.Hidden Room
Hidden passages have a long history of appearing in fictional novels and films but an even richer past in reality.
There are several ways for you to do something like this:
1) Design in the passageway or the room when building a new house
2) Find a void in your existing house and convert it (many existing homes have voids under staircases, next to fireplaces, etc.)
3) Create a room or passage by adding a new wall

Secret Room Closed
In recent times, however, many more modest individuals have created (or discovered) secret passages in ordinary everyday households and there are even companies dedicated to designing secret doors, rooms and passages in middle-class houses. In some cases the discovery of a secret room is a wonderful find.

How to Build a Secret Passage in Your Home
Read more: How to Build a Secret Passage in Your Home | eHow.com http://www.ehow.com/how_2144408_build-secret-passage-home.html#ixzz1xGefQVeW

Secret Room Open
Hidden rooms today usually serve one of two purposes: security or fun. Sometimes a hidden door is used to disguise a safe or a panic room where residents can hide in an emergency.
http://unusuallife.com/2008/05/12/secret-rooms/