When the royal family visits Trondheim, they stay here -- and they never run out of bedrooms. With 144 rooms, it is the largest wooden building in northern Europe, a massive pile in the late baroque style. This buttercup-yellow royal palace near the marketplace was built as a private home by a rich merchant's widow in the 1770s, when Trondheim began to regain its prosperity. The exterior walls were notched together, log-cabin style, then sheathed with wooden exterior panels. The unpretentious furnishings represent an amalgam of design styles.