As an acid-free substance, hardboard is a viable medium for family portraits. Hardboard, a heavy type of fiberboard made from mechanical pulp, graces homes in the form of siding and more recently as artists' canvas. Hardboard comes in various finishes, thicknesses and types to mimic coarse chipboard, plywood or real wood.
Boeing Everett Factory. Largest usable space by volume. This building claims to be the outright biggest of the worldâs biggest buildings due to its mammoth volume. Some of the greatest planes ever built are assembled here, such as the wide-body Boeing 747, 767s, 777s, and the new 787 Dreamliner.
Tallest residential building in the world: 23 Marina in Dubai  --- 395m (1,296 ft.), with 90 storeys.  Tallest hotel in the world: Makkah Royal Clock Tower Hotels ---  601m (1,972 ft.) with 95 storeys.  Tallest structure in the world: Burj Khalifa, Dubai ---  828m (2,717 ft.).  Tallest tower in the world: Tokyo Sky Tree, Japan ---  634m (2,080 ft.).  First Building to have more than 100 storeys: Empire State  Building (New York City, USA) --- 381m (1,250 ft.), 102 storeys.