It's a patient and ambitious puzzle builder (and not necessarily a child) who attempts to assemble a three-dimensional version of our nation's great capitol--but the results are well worth it. This amazingly detailed replica--with cornices, columns, porticos--is formed from 718 sturdy, foam-backed puzzle pieces. The instructions (hint: start with the base and work your way up) are clear and step-by-step. But if, halfway through the mission, a piece seems to be missing, the kit comes with a black and white diagram to mark and send to the manufacturer for a free-of-charge replacement. --Hillary Quinn