I was in a house once where one of the wooden panels in the living room that looked seamless popped out and there was like a whole suite behind it (bedroom, bathroom, office). it was pretty coolI'd love to have a Secret/hidden room but not an actual Panic room. I'd use something that would be hidden behind a bookcase or something like that but just for show or for a secluded retreat room.
but if I were ever building my dream house, I'd be more likely to include a nuclear shelter than anything else.
