Capitol Hill in the context of "Constitution Avenue"

The Library of Congress (LC or sometimes LOC) is a research library in Washington, D.C., serving as the library and research service for the United States Congress and the de facto national library of the United States. It also administers copyright law through the United States Copyright Office, and it houses the Congressional Research Service.

Founded in 1800, the Library of Congress is the oldest federal cultural institution in the United States. It is housed in three buildings on Capitol Hill, adjacent to the United States Capitol, along with the National Audio-Visual Conservation Center in Culpeper, Virginia, and additional storage facilities at Fort George G. Meade and Cabin Branch in Hyattsville, Maryland. The library's functions are overseen by the librarian of Congress, and its buildings are maintained by the architect of the Capitol. The LC is one of the largest libraries in the world, containing approximately 173 million items and employing over 3,000 staff. Its collections are "universal, not limited by subject, format, or national boundary, and include research materials from all parts of the world and in more than 470 languages".

The Thomas Jefferson Building, also known as the Main Library, is the oldest of the Library of Congress buildings in Washington, D.C. Built between 1890 and 1897, it was initially known as the Library of Congress Building. In 1980, the building was named in honor of Thomas Jefferson (1743–1826), a Founding Father, the principal author of the Declaration of Independence, and the third U.S. president. In 1815, the purchase of Jefferson's book collection formed a core foundation for the library's collection.

The building is located on First Street, S.E. between Independence Avenue and East Capitol Street in the federal national capital city of Washington, D.C., across from the United States Capitol on Capitol Hill. It is adjacent to the library's additional buildings in the Library of Congress complex, the John Adams Building (built in the 1930s) across Second Street, and the James Madison Memorial Building (built in the 1970s) across Independence Avenue to the south.

The United States Capitol, often called the Capitol or the Capitol Building, is the seat of the United States Congress, the legislative branch of the federal government. It is located on Capitol Hill at the eastern end of the National Mall in Washington, D.C. Although no longer at the geographic center of the national capital, the U.S. Capitol forms the origin point for the street-numbering system of the district as well as its four quadrants. Like the principal buildings of the executive and judicial branches, the Capitol is built in a neoclassical style and has a white exterior.

Central sections of the present building were completed in 1800, when the 6th U.S. Congress convened there on November 17, 1800, moving the national capital from Philadelphia to Washington, D.C.. The building was partly destroyed in the 1814 Burning of Washington by the British, then was fully restored within five years. The building was enlarged during the 19th century, by extending the wings for the chambers for the bicameral legislature as more states were admitted to the union, with the House of Representatives housed in the south wing and the Senate housed in the north wing. The massive dome was completed around 1866 just after the American Civil War. The east front portico was extended in 1958. The building's Visitors Center was opened in the early 21st century.

The National Audio-Visual Conservation Center (NAVCC) is a branch of the Library of Congress devoted to preserving the United States' audio-visual history. It includes the Packard Campus (PCAVC), opened in 2007 to store the then entire 6.3 million piece collection of the Library's movie, television, and sound artifacts, the Center's largest facility; the Library's Motion Picture and Television Division and Recorded Sound Division reference centers on Capitol Hill; the Mary Pickford Theater; and any other Library of Congress audio-visual storage facilities that remain outside the Packard Campus audiovisual archive located inside Mount Pony in Culpeper, Virginia.

Southeast (SE or S.E.) is the southeastern quadrant of Washington, D.C., the capital of the United States, and is located south of East Capitol Street and east of South Capitol Street. It includes the Capitol Hill, Hill East, and Anacostia neighborhoods, the Navy Yard, the Joint Base Anacostia-Bolling (JBAB), the U.S. Marine Barracks, the Anacostia River waterfront, Eastern Market, the remains of several Civil War-era forts, historic St. Elizabeths Hospital, RFK Stadium, Nationals Park, and the Congressional Cemetery. It also contains a landmark known as "The Big Chair," located on Martin Luther King Jr. Avenue. The quadrant is split by the Anacostia River, with the portion that is west of the river sometimes referred to as "Near Southeast". Geographically, it is the second-smallest quadrant of the city.

East Capitol Street is a major street that divides the northeast and southeast quadrants of Washington, D.C., United States. It runs due east from the United States Capitol to the DC-Maryland border. The street is uninterrupted until Lincoln Park then continues eastward around the RFK Stadium campus. East of the stadium, East Capitol crosses the Anacostia River via the Whitney Young Memorial Bridge and then goes underneath Route 295 before crossing into Prince George's County, Maryland, where it becomes Maryland State Highway 214.

The western stretch of East Capitol Street passes through the Capitol Hill and Hill East neighborhoods. East Capitol Street is home to the Folger Shakespeare Library, US-Asia Institute, Les Aspin Center for Government, East Capitol Street Car Barn, D.C. Armory, and the future New Commanders Stadium.

The John Adams Building is the second-oldest of the buildings of the Library of Congress of the United States. Built in the 1930s, it is named for John Adams, the second president, who signed the law creating the Library of Congress in 1800. The building is in the Capitol Hill district of Washington D.C. next to the library's main building (now known as the Thomas Jefferson Building) in the Capitol Complex. The Adams building opened to the public on April 5, 1939, and before being named for the president in 1980, was simply called The Annex building. It is designed in a restrained but very detailed Art Deco style and faced in white Georgia marble. It is located on Second Street SE between Independence Avenue and East Capitol Street in Washington, DC.

The Thurgood Marshall Federal Judiciary Building (TMFJB) at the crossroads of the Capitol Hill and NoMA neighborhoods in Washington, D.C., houses offices that support the work of the United States Courts, including the Administrative Office of the United States Courts, the Federal Judicial Center, the United States Sentencing Commission, and the Office of the Clerk of the Judicial Panel on Multidistrict Litigation.

The building was named after Thurgood Marshall, the first African-American justice of the Supreme Court; and is part of the United States Capitol Complex under the Architect of the Capitol's Supreme Court Building and Grounds jurisdiction which it shares in common with the United States Supreme Court Building that houses the Supreme Court of the United States.