Have you ever wondered what might be lurking inside your walls? No, we're not talking about ghosts or monsters: We're talking about treasures that may have been left there years before, completely preserved undisturbed until someone discovers them. If you've got an old house, or recently inherited property, you might think twice about what's inside after seeing this list. These are 25 people who found the most epic treasures in the most unlikely places: The floors, ceilings, and walls. Who knew that such amazing stuff could be so well-hidden? What would you do if you came across something like #13?