Popsugar Living Diy Man's Bookcase Turns Into a Secret Room This Bookcase Opens Up to a Secret Room That'll Blow Your Mind August 20, 2015 by Marina Liao View On One Page Photo 9 of 12 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 9 View from the rear left corner: The room is only about 5 feet by 12 feet. The electric fireplace runs fake fire but can be turned into a space heater for Winter. Previous Next Start Slideshow DIYHome RenovationsImgur