That's right! We're talking about hidden doors here! Nothing like an awesome built-in that also doubles as a door into another room of the house (maybe even a hidden room if your home is super castle-esque! Ha!) In all seriousness though, hidden doors aren't as impossible to incorporate into your home as you might have thought.
And another obviously great thing about hidden doors is that they can often take the place of closet doors- in which case that closet becomes a wonderfully smart place to store valuables! Hidden doors can essentially turn closets into built-ins safes, because they definitely aren't something that the average intruder is going to think to check out!