Organization of American States

Columbus Memorial Library is located in the headquarters of the Organization of American States in Washington, D.C.The library offers extensive collection of books and periodicals that date back to 1535.

The Pan American Union Building is the headquarters for the Organization of American States. It is located at 17th Street N.W. between C Street N.W. and Constitution Avenue, Northwest, Washington, D.C.

The Van Ness Mansion was completed for John Peter Van Ness and Marcia Van Ness in 1816 by Benjamin Henry Latrobe on 17th Street, Washington, D.C. They entertained the Madisons, James Monroe, George Washington Parke Custis and John Tayloe III at their mansion. The mansion was described as the "finest house in America". It was built on land that had been owned by Marcia's father, David Burnes, who left 500 acres along the Potomac River to Van Ness. It was one of the most expensive houses in the country, fit with hot and cold running water, a modern feature at the time, and the mansion was the first residence in the city to have that luxury. Latrobe added a feature designed to maintain a sense of privacy when food was conveyed to dining rooms. Servants accessed rotating servers from a hallway that allowed them to deliver food without entering the room. He installed them previously at the Adena Mansion in Chillicothe, Ohio. It had the country's largest and coolest wine vault. Latrop said that the Van Ness Mansion was "the best house I ever designed". It overlaid his "American rational-configuration on the kind of English residential model that impressed him during his work for and study with S. P. Cockerell."Latrobe also worked with John Peter Van Ness on the reconstruction of Washington, D.C. public buildings. Van Ness was a commissioner of the Capitol reconstruction commission, along with Richard B. Lee and Tench Ringgold. The mansion degraded over time. In 1907, the mansion was razed and the Pan American Union Building was built on the site. The stables, also designed by Latrobe, were not demolished at that time. The stuccoed building existed was located at 18th and C Streets.

Queen Isabella, also known as Queen Isabella (1451–1504), is an outdoor sculpture of Isabella I of Castile, installed outside the Pan American Union Building of the Organization of American States at 17th Street and Constitution Avenue NW in Washington, D.C., in the United States.

The Founders of the Daughters of the American Revolution is a sculpture located beside Constitution Hall in Washington, D.C., United States. Dedicated in 1929, the sculpture was created by artist and socialite Gertrude Vanderbilt Whitney in honor of the four founders of the Daughters of the American Revolution (DAR): Mary Desha, Mary Smith Lockwood, Ellen Hardin Walworth, and Eugenia Washington. The sculpture is one of three outdoor artworks in Washington, D.C. by Whitney, the other two being the Titanic Memorial and the Aztec Fountain at the Pan American Union Building.

The Memorial Continental Hall in Washington, D.C. is the national headquarters of the Daughters of the American Revolution (DAR). It is located at 1776 D Street NW, sharing a city block with the DAR's later-built Administration Building, and Constitution Hall. Completed in 1910, it is the oldest of the three buildings. It was the site of the 1922 Washington Naval Conference, a major diplomatic event in the aftermath of World War I. The building was declared a National Historic Landmark in 1972.

Art Museum of the Americas (AMA), located in Washington, D.C., is the first art museum in the United States primarily devoted to exhibiting works of modern and contemporary art from Latin America and the Caribbean. The museum was formally established in 1976 by the Organization of American States (OAS) as the Museum of Modern Art of Latin America. Artists represented in the AMA's permanent collection include Carlos Cruz-Diez, Candido Portinari, Pedro Figari, Fernando de Szyszlo, Amelia Peláez, and Alejandro Obregón. The art collection of the OAS was initiated under the organization's Visual Arts Unit, beginning with the first donated artwork by the Brazilian neo-realist artist Portinari, in 1949. In the following decade the Permanent Council of the OAS determined to establish an acquisitions fund, in order to build up a permanent collection of artworks by significant contemporary artists from the member states of the OAS. A number of works were also purchased from or donated directly by artists, after the temporary exhibitions periodically held at the OAS gallery. The Art Museum of the Americas itself was established in 1976 by OAS Permanent Council resolution, on the occasion of the United States Bicentennial. The museum opened in what was formerly the official residence of the OAS Secretary General, a Spanish Colonial-style structure designed in 1912 by the architect Paul Cret. Initially the permanent collection held some 250 artworks, expanding over the next quarter-century to over 2000 items of painting, sculpture, installations, photography, and drawing, from the early 20th century and onwards. In addition to its permanent collection of mainly Caribbean and Latin American art, AMA hosts temporary and special exhibitions from across the region, and provides educational seminars and lectures from invited speakers. The Art Museum of the Americas has also expanded its programs to include evening events, such as Art After Dark, with cutting edge music, video, performance, and installation art.

Excluding the White House, the Lockkeeper's House, C & O Canal Extension is the oldest building on the National Mall, built in 1837 at what is now the southwest corner of 17th Street, NW and Constitution Avenue, NW, near Constitution Gardens. The building dates to a period when the south end of 17th Street, NW was a wharf and Constitution Avenue, NW was the location of a section of the Washington City Canal, which connected the Potomac and Anacostia rivers. An eastward extension of the Chesapeake and Ohio Canal (C&O Canal) met the Potomac River and the Washington City Canal at a canal lock.The 350 square foot house served the canal lock keeper, who collected tolls, recorded commerce, maintained the canal and managed traffic.

El Maiz is a modern sculpture, by Édgar Negret.It is located at AMA | Art Museum of the Americas, at the Organization of American States, Constitution Avenue and 18th Street, N.W. Washington, D.C.

General Jose Gervasio Artigas is a bronze statue, in Washington, DC, capital of the United States, at the intersection of Constitution Avenue and Virginia Avenue, at 18th Street. It is one of a set called the Statues of the Liberators. José Artigas was a 19th-century general, sometimes called "the father of Uruguayan independence", "Protector de los Pueblos Libres" or "Jefe de los Orientales".The Washington, DC, statue was created before 1948 by Juan Manuel Blanes. At its base are engraved the words "Liberty of America is my dream and its attainment my only hope." Although this statue was delivered before the identical one in Montevideo, Minnesota, Montevideo erected theirs in 1949 and the Washington, DC, Parks Department did not erect its until a year later on 19 June 1950. Both statues were gifts from the people of Uruguay and are replicas of an original in San José de Mayo, Uruguay, created by Italian sculptor Dante Costa. The Uruguayan officer Edgardo Ubaldo Genta had conceived the idea in 1940 as a good-will gesture.

DAR Constitution Hall is a concert hall located at 1776 D Street NW, near the White House in Washington, D.C. It was built in 1929 by the Daughters of the American Revolution to house its annual convention when membership delegations outgrew Memorial Continental Hall. Later, the two buildings were connected by a third structure housing the DAR Museum, administrative offices, and genealogical library. DAR Constitution Hall is still owned and operated by the National Society of Daughters of the American Revolution. It was designated a National Historic Landmark in 1985. It has been a major cultural center of the city since its construction, and houses its largest auditorium.

An equestrian statue of Venezuelan military and political leader Simón Bolívar by the American artist Felix de Weldon is located in Washington, D.C., at Virginia Avenue NW, 18th Street NW, and C Street NW, near the United States Department of Interior and the Pan American Union Building of the Organization of American States. It was surveyed as part of the Smithsonian Institution's Save Outdoor Sculpture! survey in 1993.