Gwrych Castle, North Wales
Built in the early 1800s, Gwrych Castle once had a total of 128 rooms, including 28 bedrooms, an outer hall, an inner hall, two smoke rooms, a dining room, a drawing room, a billiards room, an oak study, and a range of accommodations for servants. During World War II, it housed 200 Jewish refugees, and was later open to the public.
Although the castle has long been vacant, it was bought several years ago with the intention of being converted into an opera house and luxury hotel, but those plans never came through.