Photograph of people walking outside on a Self-Guided Tour of Capitol Hill
Visitors can tour many highlights on Capitol Hill without registering.


Photo of Capitol Hill steps.
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Condition of the stone on the Russell Building pre-restoration.
Stone preservation will continue to be a priority of the AOC as the best way to...


U.S. Botanic Garden Conservatory


Constructed by the Architect of the Capitol in 1933, this historic Lord & Burnham greenhouse contains two courtyard gardens and 10 garden rooms under glass, totaling 28,944 square feet of exhibition space.


100 Maryland Avenue SW, Washington, DC 20024


The U.S. Botanic Garden is a living plant museum with exhibits that interpret the role of plants in supporting Earth's diverse and fragile ecosystem and in enriching human life. Its collections date to the 1840s when 250 plants and an unknown quantity of propagation material gathered by the Wilkes Exploring Expedition (1838-1842) were brought back to Washington.


The Garden's present conservatory is a two-part building. The front is a one-story limestone structure with 11 lofty arches inspired by the seventeen-century orangery at Versailles near Paris. The facade features four alternating keystones carved in the images of Pan, Pomona, Triton and Flora. At the rear is a glass and aluminum greenhouse conceived in the glass house tradition first seen in the 1850s Crystal Palace in London.

 Photo caption below.

Left) Laying of the cornerstone, November 12, 1931; Right) Conservatory aluminum structure frames the Capitol Dome in 1932.

The conservatory was designed by the Chicago firm of Bennett, Parsons & Frost and completed in 1933.

The U.S. Botanic Garden was formally placed under the jurisdiction of the Joint Committee on the Library of Congress in 1856 and has been administered through the Architect of the Capitol since 1934.

Find out what's blooming in the Conservatory at usbg.gov/gardens/conservatory-whats-bloom.

Last Updated: February 03, 2016