Stewards of the iconic buildings and grounds of Capitol Hill since 1793.


The bronze Statue of Freedom by Thomas Crawford is the crowning feature of the Dome of the United States Capitol.
The bronze Statue of Freedom by Thomas Crawford is the crowning feature of the...


A crowd of people visiting the Capitol during visitor hours
Please note: Many of these Capitol Hill buildings are working office buildings...


Photo of Stephen T. Ayers, FAIA, LEED AP, Architect of the Capitol in front of the Capitol Building
On February 24, 2010, President Barack Obama nominated Mr. Ayers to serve as...


Ginseng, the Divine Root.
Learn about ginseng from author David A. Taylor on September 26 at noon.

John Adams Building

John Adams Building

Outside image of the John Adams Building with purple flowers in front.

Second Street SE, between Independence Avenue and East Capitol Streets


The second building constructed for the Library of Congress opened in 1939. For years it was known simply as “The Annex” before being named for President John Adams.

When it opened in 1939, the library's shelving capacity tripled to 15 million volumes. A silent pneumatic system whisked books in leather pouches from the annex to the main reading room across the street in a breathtaking 28 seconds.

In 1928 the Librarian of Congress, Herbert Putnam, urged Congress to authorize construction of an annex to relieve the potential space shortage that was sure to affect the 31-year-old main building. Despite stack space that was added in 1910 and 1927, the prospect of running out of room in the near future was real.

On June 13, 1930, $6,500,000 was appropriated to build the annex Putnam had requested. The funds were also used to build a tunnel to connect it to the main building and to make an addition to the east front of the old building (now known as the Thomas Jefferson Building) for a rare book room. An additional appropriation in 1935 brought the total authorization to $8,226,457.

David Lynn, the Architect of the Capitol, commissioned the Washington architectural firm of Pierson & Wilson to design the building, with Alexander Buel Trowbridge as consulting architect. The contract stipulated completion by June 24, 1938, but the building was not ready for occupancy until December 2. The move of the Card Division started on December 12, and it opened its doors to the public in the new building on January 3, 1939. In 1976 the annex was named for Thomas Jefferson, but was changed in 1980 to honor John Adams.

The John Adams Building is a well detailed but restrained Art Deco design, an architectural and decorative style inspired by the Exposition des Arts Decoratifs held in Paris in 1925. The exterior is faced with white Georgia marble, which is enlivened with a limited amount of carved decoration. Thoroughly modern in every respect, the building's interior showcased such new materials as acoustical block, Formica, vitrolit and glass tubing. Decorative features and metalwork in the building's public spaces are superb examples of Art Deco's streamline classicism and decorative cubism.

The building rises five stories above ground, with the fifth story set back 35 feet. It contains 180 miles of shelving (compared to 104 miles in the Jefferson Building) and can hold ten million volumes. There are 12 tiers of stacks, extending from the cellar to the fourth floor. Each tier provides about 13 acres of shelf space. Surrounding the central bookstack core are three floors of offices with access to natural light and air.  

Last Updated: September 25, 2014