Washington, D.C.

This list of tallest buildings in Washington, D.C. ranks high-rises in the U.S. capital of Washington, D.C. The tallest structure in the city, excluding radio towers, is the Washington Monument, which rises 555 feet (169 m) and was completed in 1884. The structure, however, is not generally considered a high-rise building as it does not have successive floors that can be occupied. The tallest habitable building in the city is the Basilica of the National Shrine of the Immaculate Conception, which rises 329 feet (100 m). The second-tallest building in Washington is the Old Post Office Building, which is 315 feet (96 m) high. The third-tallest building in the city is the Washington National Cathedral, which rises 301 feet (92 m) above grade. The cathedral is built on high ground known as Mount St. Alban, 400 feet (120 m) above sea level, which makes the central tower the "highest" point in the District. As of November 2011, there are 410 completed high-rises in the city.

The Government of the District of Columbia operates under Article One of the United States Constitution and the District of Columbia Home Rule Act, which devolves certain powers of the United States Congress to the Mayor and thirteen-member Council. However, Congress retains the right to review and overturn laws created by the council and intervene in local affairs.

Lead contamination in Washington, D.C., drinking water, first discovered in 2001, left thousands of children with lifelong health risks, and led to a re-evaluation of the use of monochloramine in public drinking-water systems. Professor Marc Edwards, an expert in plumbing corrosion, discovered lead levels at least 83 times higher than the accepted safe limit while performing research into premature pipe corrosion for the District of Columbia Water and Sewer Authority (WASA). He found that the decision to change from chlorine to chloramine as a treatment chemical had caused the spike in lead levels. After the Washington Post ran a series of front-page articles about Edwards's findings, resulting in widespread public concern, the United States House of Representatives conducted an investigation. The House found that the U.S. Centers for Disease Control and Prevention (CDC) had made "scientifically indefensible" claims in a report that had indicated there was no risk from the high lead levels. The Post investigation uncovered evidence of widespread misreporting of lead levels at water agencies across the United States, leading to regulatory crackdowns and changes in Environmental Protection Agency policies. The problem was addressed in 2004 by adding additional treatments to the water, preventing the chloramine from dissolving lead in the water mains, solder joints, and plumbing fixtures. In 2010, the CDC reported that 15,000 homes in the Washington, D.C., area might still have water supplies with dangerous levels of lead.

Fletcher Chapel, also known as Church of God and the Saints of Christ Church, is a historic chapel located in Northwest, Washington, D.C. It was built in 1854 by the McKendree Methodist Episcopal Church to start a new congregation known as Fletcher Chapel Methodist Episcopal Church. The building was purchased by the Church of God and the Saints of Christ Church in 1904 and added to the National Register of Historic Places in 1997.

The Yale Steam Laundry is a historic residence located on 437–443 New York Avenue, Northwest, Washington, D.C., in the Mount Vernon Square neighborhood.

The District of Columbia's at-large congressional district is a congressional district based entirely of the District of Columbia. According to the U.S. Constitution, only states may be represented in the Congress of the United States. The District of Columbia is not a U.S. state and therefore has no voting representation. Instead, constituents in the district elect a non-voting delegate to the U.S. House of Representatives. Despite lacking full voting privileges on the floor of the House of Representatives, delegates are voting members in U.S. Congressional committees and they lobby their congressional colleagues regarding the District's interests. While the office was initially created during the Reconstruction Era by the Radical Republicans, Norton P. Chipman (R) briefly held the seat for less than two terms before the office was eliminated completely. The District of Columbia Delegate Act Pub.L. 91–405, 84 Stat. 845-2 of 1970 authorized voters in the District of Columbia to elect one non-voting delegate to represent them in the United States House of Representatives. The act was approved by Congress on September 22, 1970 and subsequently signed into law by President Richard Nixon. Democrat Walter E. Fauntroy was elected as the district's delegate to Congress in a special election on March 23, 1971, receiving 58 percent of the 116,635 votes cast.Since 1993, when the House of Representatives has been under Democratic control, delegates, including the District of Columbia's delegate, have been allowed to cast non-binding floor votes when the House of Representatives was operating in the Committee of the Whole.The district is currently represented by Democrat Eleanor Holmes Norton.

The Augusta Apartment Building, along with the Louisa Apartment Building, are historic structures located in the Northwest Quadrant of Washington, D.C. Washington architect Arthur B. Heaton designed both buildings, which were built a year apart from one another in 1900 and 1901. They are two of his earliest commissions. The Tudor Revival façade of the buildings emulate the mansions that were built during the late Victorian age. The exterior features Flemish bond and tapestry brick with decorative motifs in both tile and limestone. It was listed on the National Register of Historic Places in 1994.

Rigo Walled Park is a neighborhood-named urban open space located on National Park Service property south of New York Avenue at L Street, NW in the Mount Vernon Square neighborhood of Washington, D.C. It is administered as part of the National Mall and Memorial Parks.

Second Baptist Church is a historic church located at 816 3rd Street NW in the Mount Vernon Triangle neighborhood of Washington, D.C. It was built in 1894 and designed by Appleton P. Clark, Jr. It was added to the National Register of Historic Places in 2004.

Mount Vernon Triangle is a neighborhood and community improvement district in the northwest quadrant of Washington, D.C. Originally a working-class neighborhood established in the 19th century, present-day Mount Vernon Triangle experienced a decline in the mid-20th century as it transitioned from residential to commercial and industrial use. The neighborhood has undergone significant and rapid redevelopment in the 21st century. It now consists mostly of high-rise condominium, apartment and office buildings. Several historic buildings in the neighborhood have been preserved and are listed on the National Register of Historic Places. Mount Vernon Triangle is now considered a good example of urban planning and a walkable neighborhood.

The Metropolitan Community Church of Washington, D.C. (also known as MCCDC) is a congregation of the Metropolitan Community Church (MCC), a Protestant Christian denomination catering to LGBT people, located in the Mount Vernon Square neighborhood of Washington, D.C. Founded in 1970 as the Community Church of Washington, D.C. (CCDC), the congregation led by Pastor Paul Breton joined the new MCC denomination in 1971 with help from local activist Frank Kameny. The original members founded MCCDC because, at the time, most churches did not welcome LGBT people. They wanted a safe space to gather, not only as LGBT people but also as LGBT Christians. The church experienced significant growth during its first 30 years, from around 65 people at its initial meeting to over 500 members in the early 2000s, despite the effects the AIDS epidemic had on the congregation. Since MCCDC's founding, several other Christian denominations have changed their views on homosexuality and now welcome LGBT people. These changes have resulted in a decline in people attending MCCDC. MCCDC spent over 20 years meeting in its founder's home, other church buildings, and a converted rowhouse, before moving to a new and permanent facility in 1992. This facility became the first new sanctuary built in the US by an LGBT religious organization. Designed by local architect Suzane Reatig, the small but imposing building, with its vaulted glass sanctuary, has received praise from critics and earned Reatig several awards.

The Northern Liberty Market, later called Convention Hall Market and Center Market, was located on the east side of 5th Street NW, between K and L, in the present-day Mount Vernon Triangle neighborhood of Washington, D.C. It operated from 1875 to 1963.