Across the street from the vast expanse of the ecologically restored woodland that is the UW Arboretum, Madison's Arbor House is the brilliant result of progressive-minded development mixed with respectful historic preservation. Innkeepers John and Cathie Imes opened the Arbor House in the former Plough Inn building, a gorgeous 19th-century structure upon which they've expanded to create a two-building, eight-room "environmental inn."