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Throughout the world, people have built structures behind walls and underground in some of the grand castles, homes, and palaces. These hidden spaces are usually concealed behind disguised doors, escape staircases, tunnels, and even in volcanic caverns. Their existence might have stemmed from our human instinct for safety and survival, much like how the animal-people build their dens in inconspicuous places like caves, the hollow of trees, under the eaves of houses, and underground. Let’s tour some of these incredible hidden structures in today’s show.