The New Narrowest House in the World

The cells at Florence ADX, the supermax prison in Colorado that holds notorious criminals like Soviet spy Robert Hanssen and al-Qaeda's Zacarias Moussaoui, are said to measure 7 by 12 feet. Someone in Poland, however, is building a house that makes those monklike dimensions look positively roomy.

Called the Keret House, this slimmest of domiciles is now being assembled in steel-skeleton form in a workshop just outside of Warsaw. When it's finished, movers will slide it into an alleyway between two large buildings at 22 Chłodna Street and 74 Żelazna Street. Looking like an aspirin tablet that got dropped between the couch cushions, the home will pose significant problems to anybody trying to fit through the door with bags of groceries: At its widest point, it measures just 4.4 feet across.