The whole question started out innocently enough with me remembering Addams Family episodes and stuff. I'm sure as heck not asking anyone to divulge their secrets!
Then a few years ago, that Jodi Foster movie "Safe Room" came out. I've got a perfect mini-basement that know one would ever suspect.
Unfortunately - it's not easily asscessable in a break in or something. But it would make a great hiding room for stuff.
TWO biggest upsides. 1) would make a great hiding place for stuff, and 2) would make a great tornado shelter.
Two BIGGEst downfalls. 1) If you die and the place sells, no one will know it is there, (and all your stuff is in it) and 2) if you use it as a tornado shelter, no will will know where to find you, and you will die anyway. lol.
Years ago, we had a banker that built his house with a bomb shelter. Always made me think of those '50's scenerios where people would be beating at the door, and one day he would open up to find himself alone and helpless.