I always wanted that too and in my imagination the entrance to my secret room would be hidden. Coolest would be a book shelf that you can move or a door without handle which is painted in the same colour as the walls. The room itself has control or panic room touch; cameras hidden in the house which are accessible in that room, entrance can be closed from the inside, the room has a second even more hidden way outside. I’d build a metal frame under the ceiling to interrupt signals and create a dead spot. Man I should build one too.
