The Riedlingen chamber grave—likely completed around around 585 B.C.—has a completely preserved ceiling, walls, and floor all made of solid oak, and was tucked away about 27 inches below the surface.
What if we told you that you can have spotless floors all while you sleep, watch TV, or vacation miles away from home? Drink spills and dust messes will disappear, and you won't have to lift a finger.