Dumbarton Oaks is a historic estate in the Georgetown neighborhood of Washington, D.C. It was the residence and gardens of Robert Woods Bliss (1875–1962) and his wife Mildred Barnes Bliss (1879–1969).
The Dumbarton Oaks Research Library and Collection was founded here by the Bliss couple, who gave the property to Harvard University in 1940. The research institute that has emerged from this bequest is dedicated to supporting scholarship in the fields of Byzantine, Pre-Columbian, and garden design and landscape architecture studies, especially through its research fellowships, meetings, exhibitions, and publications. Dumbarton Oaks also opens its gardens and museum collections to the public, and hosts public lectures and a concert series.
The land of Dumbarton Oaks was formerly part of the Rock of Dumbarton grant that Queen Anne made in 1702 to Colonel Ninian Beall (ca. 1625-1717). About 1801, William Hammond Dorsey (1764–1818) built the first house on the property (the central block of the existing structure) and an orangery, and in the mid-nineteenth century, Edward Magruder Linthicum (1787–1869) greatly enlarged the residence and named it The Oaks. The Oaks also was the Washington residence of U.S. Senator and Vice President John C. Calhoun (1782–1850) between 1822 and 1829.
In 1846, Edward Linthicum bought the house, and enlarged it. In 1891, Henry F. Blount bought the house.
Mildred and Robert Woods Bliss acquired the property in 1920, and in 1933 they gave it the name of Dumbarton Oaks, combining its two historic names. The Blisses engaged the architect Frederick H. Brooke (1876–1960) to renovate and enlarge the house (1921–1923), thereby creating a Colonial Revival residence from the existing Linthicum-era Italianate structure. Over time, the Blisses increased the grounds to approximately 54 acres (220,000 m2) and engaged the landscape architect Beatrix Farrand (1872–1959) to design a series of terraced gardens and a wilderness on this acreage, in collaboration with Mildred Bliss (1921–1947). The Blisses’ architectural additions to the estate included four service court buildings (1926) and a music room (1928), designed by Lawrence Grant White (1887–1956) of the New York City architectural firm of McKim, Mead and White, and the superintendent’s dwelling (1933), designed by Farrand. Later renamed the Fellows Building, this building is now known as the Guest House.