Wye Plantation, near Tunis Mills (Easton), Maryland.Historic American Buildings Survey.Wye House, Orangery, Bruffs Island Road, Tunis Mills, Talbot County, MD 1936. This orangery sits behind the main house and consists of a large open room with two smaller wings added at some point after the initial construction. The south-facing wall consists of large triple-hung windows. A second story was traditionally part of the style of orangeries at the time of its construction in the middle to late 18th century as a way of further insulating the main section where the plants were kept. According to the current resident, Ms. Tilghman (a descendant of the Lloyd family), it served as a billiards room for the family. This plantation is also notable as having been the home of Frederick Douglass as a young slave boy. George Washington designed and constructed an orangery for his home at Mount Vernon, Virginia. It was designed in the Georgian Style of architecture and stands just north of the mansion facing the upper garden. Completed in 1787, it is one of the largest buildings on the Mount Vernon estate. Washington grew lemon and orange trees and sago palms there. Considered an ambitious structure by his contemporaries, the main room featured a vaulted ceiling for air circulation, and incorporated radiant heating from a series of flues under the floor. The original greenhouse burned in 1835, but was rebuilt on the same site in 1951 using original plans. 19th century The Dumbarton Oaks estate in Washington, D.C. includes an orangery built in 1810 that is now used to house gardenias, oleander, and citrus plants during the winter. Another orangery stands at Hampton National Historic Site near Towson, Maryland. Originally built in 1820, it was part of one of the most extensive collections of citrus trees in the U.S. by the mid-19th century. The current structure is a reconstruction built in the 1970s to replace the original, which burned in 1926. The orangery at the Battersea Historic Site in Petersburg, Virginia is currently under restoration. Originally built between 1823 and 1841, it was converted into a garage in a later period. In the late 19th century, Florence Vanderbilt and husband Hamilton Twombly built an orangerie on their estate, Florham, designed by architects McKim, Mead & White. It is now on the Florham Campus of Fairleigh Dickinson University. 20th century An 18th-century style orangery was built in the 1980s at the