My friend is a wealthy person, and also rather paranoid about that fact. When he built his new house, he made some secret lockers at his home for storing money and gold, as well as installing CCTV systems for his house. We usually put a kind of terrace for properties with concrete which we call as the roof of the house which is usually ten feet up from the floor. But he put double concrete for his house, that is one roof, ten feet up and another roof twelve feet up. There is a secret space between two roofs which is not easily visible. My friend keeps all his money in that place and locks them. There is a special arrangement of flowery designs so that the door to this place is kept hidden. Only by operating the remote, the flowery design moves and we can see the locker inside. This idea was given by his civil engineer and my friend feels secure now.