Cannon House Office Building

The O'Neill House Office Building was a congressional office building located near the United States Capitol at 301 C Street SE in Washington, D.C. Initially known as House Office Building Annex No. 1, it was named after former Speaker of the House Thomas "Tip" O'Neill in 1990.The building was originally constructed as a hotel in 1947 and operated as the Hotel Congressional, with furnished apartments rented by the month, plus meeting rooms and restaurants. Congress acquired the building in 1957 and leased it back to the hotelier. The Leadership Conference on Civil Rights coordinated lobbying efforts for passage of the Civil Rights Act of 1964 from Room 410 of the hotel. In 1972, it was turned into an office building and renamed House Office Building Annex No. 1. House Judiciary Committee staffers worked out of the building during the Watergate investigation. From 1983 to 2001, the third and fourth floors of the building were residences for the dormitory for House Pages. The building was declared structurally unsound and demolished in 2002. A parking lot is currently on the site.

The Richards Building was the headquarters of the U.S. Coast and Geodetic Survey from 1871 to 1929. It was located in Washington, D.C., on a block immediately south of the United States Capitol. It was demolished in 1929 to construct the Longworth House Office Building.

The Longworth House Office Building (LHOB) is one of five office buildings used by the United States House of Representatives. The building is located south of the Capitol, bounded by Independence Avenue, New Jersey Avenue, C Street S.E., and South Capitol Street, in southeast Washington. It has a floor area of 599,675 square feet (55,711.6 m2) and has a total of 251 congressional offices and suites, five large committee rooms, seven small committee rooms, and a large assembly room now used by the Ways and Means Committee. The building was named in 1962 in honor of the former Speaker of the House, Nicholas Longworth of Ohio. He served as Speaker from 1925 until Republicans lost their majority in 1931, the same year he died, and the same year the building was authorized.

The Butler Building was a mansion in Washington, D.C., constructed by Benjamin Franklin Butler. It served as the headquarters of the U.S. Marine Hospital Service, and its successor the Public Health Service, from 1891 until 1929. It also contained a purpose-built fire-proof unit to store archives of the U.S. Coast and Geodetic Survey. It was demolished in 1929 to construct the Longworth House Office Building.

Capitol South is a Washington Metro station in the Capitol Hill neighborhood of Washington, D.C., United States. The island-platformed station was opened on July 1, 1977, and is operated by the Washington Metropolitan Area Transit Authority (WMATA). The station currently provides service for the Blue, Orange, and Silver Lines.

The Mary Pickford Theater, named in honor of silent film star Mary Pickford, is the "motion picture and television reading room" of the United States' Library of Congress in Washington, D.C. It is on the third floor of the Library of Congress Madison building in downtown Washington. The theater screens classic and contemporary movies and television shows, often organized by theme. All screenings are free, though reservations must be made, as the theater accommodates only 64 people. In 2020, showings were postponed due to the COVID-19 pandemic.

The Law Library of Congress is the law library of the United States Congress. The Law Library of Congress holds the single most comprehensive and authoritative collection of domestic, foreign, and international legal materials in the world. Established in 1832, its collections are currently housed in the James Madison Memorial Building of the Library of Congress. Law staff rely on and utilize 2.9 million volumes of primary legal sources, 102.18 million microforms, 99,000 reels of microfilm, 3.18 million pieces of microfiche, and 15,600 tangible electronic resources (CD-ROMs and other disks), making it is the largest law library in the world.

The Court of Neptune Fountain is a group of bronze sculptures made by Roland Hinton Perry in 1897–98. Jerome Connor may have assisted in their manufacture.The sculptures are located at the Library of Congress, at Independence Avenue and 1st St S.E. Washington, D.C. The god Neptune is flanked by figures of the Tritons, each blowing a conch shell.

The First Street Tunnel is a two-track, soft-earth tunnel built between 1904 and 1906 by the Washington Terminal Company to serve as the southern approach to Union Station in Washington, D.C. Currently owned by Amtrak, it connects to lower-level tracks and platforms at the station, passes under Capitol Hill and connects to the RF&P Subdivision (CSX Transportation) and Long Bridge, offering through railway service to Alexandria, Virginia, and points west and south. Unlike the Northeast Corridor tracks north of Union Station, the tunnel tracks are not electrified, so southbound trains leaving Union Station must switch to diesel locomotives before entering the tunnel. Exiting Union Station, the tunnel runs due south under First Street NE and SE before curving to the southwest under a parking lot near the Capitol South Metro station. Its southern portal is just east of South Capitol Street at the intersection of D Street SE and New Jersey Avenue SE. The tunnel's height is 17 feet (5.2 m).

The James Madison Memorial Building is one of three United States Capitol Complex buildings that house the Library of Congress. The building was constructed from 1971 to 1976, and serves as the official memorial to United States Founding Father and president James Madison. It is located between First and Second Streets SE on Independence Avenue, in Washington, D.C.. In addition to various book and multimedia collections, it houses the United States Copyright Office, which is under the jurisdiction of the Librarian of Congress.

Sojourner Truth is a public artwork by Canadian sculptor Artis Lane, located in Emancipation Hall at the United States Capitol Visitor Center in Washington, D.C. It was the first statue honoring an African-American woman in the U.S. Capitol building.

The C Street Center is a three-story brick townhouse in Washington, D.C. operated by The Fellowship. It is the former convent for nearby St. Peter's Church. It is located at 133 C Street, SE, behind the Madison Building of the Library of Congress and a short distance from the United States Capitol, Republican National Committee, Democratic National Committee and House of Representatives Office Buildings. The structure has 12 bedrooms, nine bathrooms, five living rooms, four dining rooms, three offices, a kitchen, and a small chapel.The facility houses mostly Republican members of Congress but prominent Democrats including Hillary Clinton are members of this organization. Prior to its current use, the building housed the offices of Ralph Nader's Congress Watch, Critical Mass Energy Project, and the Tax Project.