  |
United States National Arboretum - http://www.usna.usda.gov/
Includes an array of display gardens, collections, and historical monuments set among native stands of eastern deciduous trees. Photo galleries, information about events and research, and horticultural information. |
| |
Dumbarton Oaks - http://www.doaks.org/
Gardens at the Washington (D.C.) academic library, designed by Beatrix Farrand, which complement its research resources in the history of landscape architecture. Garden tour in photos. |
| |
The United States Botanic Garden - http://www.usbg.gov/
Located on the Capitol Grounds, this garden features a variety of living exhibits, including seasonal exhibits in the conservatory and Bartholdi Park, and environmental and educational features in the National Garden. |
| |
Virtual Tour of The Gardens at Dumbarton Oaks - http://gardenhomearchitects.com/21-00-Virtual_Tour_of_Dumbarton_Oaks_Garden.htm
A presentation of 50 photos of the Gardens, along with brief annotations. |