Here's an incredible look at the Keret House in Warsaw, Poland, the world's narrowest house. It measures only four feet wide (1.2 meters), but comes equipped with a bathroom, a kitchen and a bedroom. An Israeli writer who rented the home will be its first tenant. Designer Jakub Szczesny envisioned this two-story aluminum and plastic house three years ago to fill a narrow space between an old house and a modern apartment block in downtown Warsaw. Click here to view the first image in today's viral picture gallery. Continue reading for a video of the world's narrowest house.