It isn't exactly common to make a house two-thirds smaller, or to remove the indoor plumbing. But that's what's been done at Montpelier, the plantation mansion of President James Madison. The brick Georgian home at the foothills of the Blue Ridge Mountains has undergone a $24 million architectural restoration with a goal of returning the structure to the way it was between 1809, when Madison was elected the nation's fourth president, and 1836, the year he died. Historians view Madison as the architect of the U.S. Constitution and the Bill of Rights.