First Street Tunnel

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.

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.

Bullfeathers of Capitol Hill is a restaurant and bar on 410 First Street SE in Washington, D.C., in the Capitol Hill neighborhood. Its name comes from President Theodore Roosevelt's favorite euphemism for "bullshit." The logo of the restaurant is a depiction of Roosevelt. It was founded in 1979 by Gordon King. It has achieved some degree of fame for its association with congressional staffers and members who have been patrons, and as a place where "lobbyists take Hill staffers to down martinis.". It has since reopened under new ownership. The new owners are Tony Harris and William Walls. The restaurant has been variously described as "one of Capitol Hill's key upscale watering holes" and "a favorite House-side dive.". Bullfeathers, Capital Hill is also the location of the Annual SWTA Legislative Breakfast.The political website PoliticsPA named it to their list of restaurants frequented by politicians.The restaurant also figured in the Mark Foley scandal. Reports indicated that Mark Foley approached a former 18-year-old intern at Bullfeathers and asked for an email.

The Capitol Power Plant is a fossil-fuel burning power plant which provides steam and chilled water for the United States Capitol, the Supreme Court, the Library of Congress and 19 other buildings in the Capitol Complex. Located at 25 E St SE in southeast Washington, D.C., it is the only coal-burning power plant in the District of Columbia, though it mostly uses natural gas. The plant has been serving the Capitol since 1910, and is under the administration of the Architect of the Capitol (see 2 U.S.C. § 2162). Though it was originally built to supply the Capitol complex with electricity as well, the plant has not produced electricity for the Capitol since 1952. Electricity generation is now handled by the same power grid and local electrical utility (Pepco) that serves the rest of metropolitan Washington.According to the U.S. Department of Energy, the facility released 118,851 tons of carbon dioxide in 2007. In 2009, it switched to using natural gas, unless coal was needed for backup capacity. In 2013, it was announced that the Capitol Power Plant would add a Cogeneration Plant to the CPP that will use natural gas in a combustion turbine in order to efficiently generate both electricity and heat for steam, thus further reducing emissions. A 7.5 megawatt cogeneration facility was completed at the CPP in 2018.

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 Cannon House Office Building, often called the "Old House Office Building," completed in 1908, is the oldest congressional office building as well as a significant example of the Beaux-Arts style of architecture. It occupies a site south of the United States Capitol bounded by Independence Avenue, First Street, New Jersey Avenue, and C Street S.E. In 1962 the building was named for former Speaker of the United States House of Representatives Joseph Gurney Cannon.

Spirit of Justice Park is a park in Washington, D.C., in the United States. Bounded by C Street to the north, D Street to the south, Delaware Ave SW to the west and New Jersey Ave SE to the east, the park is located south of the United States Capitol and is separated into two sections by South Capitol Street Southwest. Spirit of Justice Park is a green roof on an underground parking garage built by the Architect of the Capitol to service the House Office Buildings. A number of buildings were demolished to make way for the House parking garage, including the George Washington Inn (pictured).

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.

Carolina On The Hill is a historic condominium building located on Capitol Hill in Washington, DC. Its address is 101 N. Carolina Ave, SE, Washington, DC, 20003.

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 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.