Oak Lawn (Washington, D.C.)

The Treaty Oak was a 350–400-year-old oak tree that once stood on the Oak Lawn estate in Washington, D.C. The estate was previously called Widow's Mite and owned by the Holmead and Nourse families. It included a large four-story Second Empire house that owner Thomas P. Morgan had expanded. The estate was bounded by 19th Street, Columbia Road, Connecticut Avenue, and Florida Avenue, on the edge of today's Dupont Circle and Adams Morgan neighborhoods. The oak tree earned its nickname due to local legends that a treaty was signed there between early settlers and Native Americans. Despite massive development in the surrounding neighborhoods during the late 19th century and early 20th century, the estate remained a wooded area and was sought by local developers. In 1922 a Masonic group purchased the estate for what was then a significant amount of money to build a massive complex that would include temples. The plans were never carried out, and in 1940 the site was chosen for the large Crystal Heights mixed development designed by Frank Lloyd Wright. That plan was also abandoned. The tree remained until 1953 when it was felled for a planned commercial development. The land where the tree and house once stood is the site of the Washington Hilton, an apartment building, and two office buildings. At the time of its destruction, the Treaty Oak was reportedly the largest oak tree in the Washington, D.C. area.

Crystal Heights (also referred to as Crystal City) was a design by American architect Frank Lloyd Wright for a hotel, apartment, and shopping complex in Washington, D.C. The project would have been built on one of the largest remaining undeveloped tracts in the city, known as the Oak Lawn estate or Temple Heights, on the edge of the Adams Morgan and Dupont Circle neighborhoods. The site was bounded by 19th Street, Columbia Road, Connecticut Avenue, and Florida Avenue, all in the northwest quadrant. One version of the design called for 2,500 hotel rooms, small apartments, parking for 1,500 cars, shops, and a 1,000-seat theater – a diversity of uses almost never seen in structures of the time – all within a complex consisting of a broad base covering the whole site topped by 15 towers. The proposal was defeated primarily by zoning requirements that prevented a multi-purpose structure at the site and forbade towers from rising more than 110 feet. The planned central tower would have been 240 feet high (73 m) and the remaining buildings 14-stories tall. After his design was rejected, Wright heavily criticized local officials and the National Capital Planning Commission. Today, the site is occupied by the Washington Hilton, commercial buildings, and an apartment building.

The Washington Hilton is a hotel in Washington, D.C. It is located at 1919 Connecticut Avenue, N.W., roughly at the boundaries of the Kalorama, Dupont Circle, and Adams Morgan neighborhoods. The Washington Hilton, located on the former site of the Oak Lawn estate, was designed by architect William B. Tabler and developed by Uris Buildings Corporation. A groundbreaking ceremony was held on June 25, 1962 and the hotel officially opened three years later, on March 25, 1965. The hotel structure features a distinctive double-arched design. It long sported the largest pillar-less hotel ballroom in the city. Numerous large events have been regularly hosted at the Hilton Washington, including the annual dinners of the White House Correspondents Association and the Radio and Television Correspondents Association, as well as the National Prayer Breakfast. During the 1960s and 1970s, the hotel hosted a number of big musical acts for concerts in their large ballroom, including The Doors and Jimi Hendrix. In 1972 it was home to the first International Conference on Computer Communications which demonstrated new ARPANET technology. The hotel was the site of the assassination attempt on President Ronald Reagan by John Hinckley Jr. on March 30, 1981. The attempt occurred at the hotel's T Street NW exit. As a result, the hotel is sometimes colloquially referred to by locals as the "Hinckley Hilton".The hotel was renamed the Hilton Washington in 1998. It was purchased in June 2007 by an investment firm jointly owned by former professional basketball star Magic Johnson. From 2009-2010 it underwent a $150 million renovation. When that was completed, the hotel returned to its original name.

On March 30, 1981, United States president Ronald Reagan was shot and wounded by John Hinckley Jr. in Washington, D.C. as he was returning to his limousine after a speaking engagement at the Washington Hilton. Hinckley believed the attack would impress actress Jodie Foster, with whom he had developed an erotomaniac obsession. Reagan was seriously wounded by a .22 Long Rifle bullet that ricocheted off the side of the presidential limousine and hit him in the left underarm, breaking a rib, puncturing a lung, and causing serious internal bleeding. He was close to death upon arrival at George Washington University Hospital but was stabilized in the emergency room, then underwent emergency exploratory surgery. He recovered and was released from the hospital on April 11. No formal invocation of sections #3 or #4 of the Constitution's 25th amendment (concerning the vice president assuming the president's powers and duties) took place, though Secretary of State Alexander Haig stated that he was "in control here" at the White House until Vice President George H. W. Bush returned to Washington from Fort Worth, Texas. White House press secretary James Brady, Secret Service agent Tim McCarthy, and DC police officer Thomas Delahanty were also wounded. All three survived, but Brady suffered brain damage and was permanently disabled. His death in 2014 was considered a homicide because it was ultimately caused by his injury.Hinckley was found not guilty by reason of insanity on charges of attempting to assassinate the president. He remained confined to St. Elizabeth's Hospital, a DC psychiatric facility. In January 2015, federal prosecutors announced that they would not charge Hinckley with Brady's death, despite the medical examiner's classification of his death as a homicide. Hinckley was released from institutional psychiatric care on September 10, 2016.

The Rwandan Ambassador to the United States is the official representative of the Government of Rwanda to the Government of the United States and is head of the Embassy of Rwanda in Washington, D.C.

Holmead's Burying Ground, also known as Holmead's Cemetery and the Western Burial Ground, was a historic 2.94-acre (11,900 m2) cemetery located in the Dupont Circle neighborhood of Washington, D.C., in the United States. It was founded by Anthony Holmead in 1794 as a privately owned secular cemetery open to the public. The city of Washington, D.C., constructed the Western Burial Ground on the remainder of the city block in 1798, and the two burial grounds became synonymous. The city took ownership of the private Holmead cemetery in 1820. The unified cemetery went into steep decline around 1850, and it was closed on March 6, 1874. Removal of remains, most of which were reinterred at Graceland Cemetery or Rock Creek Cemetery, continued until 1885.

Wyoming Apartments is an historic apartment building, located at 2022 Columbia Road, Northwest, Washington, D.C. in the Kalorama neighborhood.

The American Geophysical Union (AGU) is a 501(c)(3) nonprofit organization of Earth, atmospheric, ocean, hydrologic, space, and planetary scientists and enthusiasts that according to their website includes 130,000 people (not members). AGU's activities are focused on the organization and dissemination of scientific information in the interdisciplinary and international fields within the Earth and space sciences. The geophysical sciences involve four fundamental areas: atmospheric and ocean sciences; solid-Earth sciences; hydrologic sciences; and space sciences. The organization's headquarters is located on Florida Avenue in Washington, D.C.

The Embassy of Gabon in Washington, D.C. is the diplomatic mission of the Gabonese Republic to the United States. It is located at 2034 20th Street Northwest, Washington, D.C. in the Adams Morgan neighborhood.The ambassador is Michael Moussa-Adamo.

Major General George B. McClellan is an equestrian statue in Washington, D.C. that honors politician and Civil War general George B. McClellan. The monument is sited on a prominent location in the Kalorama Triangle neighborhood due to efforts made by area residents. The statue was sculpted by American artist Frederick William MacMonnies, a graduate of the École des Beaux-Arts whose best known work is a statue of Nathan Hale in New York City. MacMonnies was chosen to design the statue following a lengthy competition organized by a statue commission, led by then Secretary of War William Howard Taft. The monument was dedicated in 1907, with prominent attendees at the ceremony including President Theodore Roosevelt, New York City mayor George B. McClellan, Jr., politicians, generals and thousands of military personnel. The sculpture is one of eighteen Civil War monuments in Washington, D.C., which were collectively listed on the National Register of Historic Places in 1978. The bronze statue, which rests on a tall granite base adorned with emblems and bronze reliefs, is surrounded by a small public park bounded by California Street, Columbia Road and Connecticut Avenue NW. The monument and park are owned and maintained by the National Park Service, a federal agency of the Interior Department.

The Lothrop Mansion, also known as the Alvin Mason Lothrop House, is an historic home, located at 2001 Connecticut Avenue, Northwest, Washington, D.C., in the Kalorama neighborhood. Until a scale-back in Russian diplomatic presence in 2017, the Lothrop Mansion housed offices for the Russian Trade Representative.

The L. Ron Hubbard House, also known as the Original Founding Church of Scientology, is a writer's house museum and former Scientology church located at 1812 19th Street NW in the Dupont Circle neighborhood of Washington, D.C., United States. Public tours are given on a regular basis. The operating Founding Church is now located at 1424 16th Street for services, bookstore and classes. The home served as the residence of Scientology founder L. Ron Hubbard from 1955 until 1959, during which time he incorporated the Founding Church of Scientology and performed the first Scientology wedding. The building is a contributing property to the Dupont Circle Historic District, a neighborhood listed on the National Register of Historic Places.