Herbert C. Hoover Building

The National Aquarium, Washington, D.C., was an aquarium in Washington D.C. It was located in the Herbert C. Hoover Building (owned by the General Services Administration), which is bounded by 14th Street NW on the east, 15th Street NW on the west, Pennsylvania Avenue NW on the north, and Constitution Avenue NW on the south.Although the National Aquarium in Washington, D.C. was smaller than its Baltimore counterpart, with the experience taking around 45 minutes, it was the nation's first free and public aquarium. It closed on September 30, 2013, after 140 years.

The Oscar S. Straus Memorial in Washington, D.C., commemorates the accomplishments of the first Jew to serve in the cabinet of a U.S. president. Oscar Solomon Straus was Secretary of Commerce and Labor under President Theodore Roosevelt from 1906 to 1909. The memorial is a marble fountain located in the Federal Triangle on 14th Street between Pennsylvania Avenue and Constitution Avenue, Northwest, Washington, D.C. It is located in front of the Ronald Reagan Building and International Trade Center. The fountain was designed by Adolph Alexander Weinman, funded with a public subscription beginning in 1929, and dedicated on October 26, 1947. In the center of the memorial is the massive fountain with the inscription "statesman, author, diplomat" and to each side are two groups of statues, one called Justice (to symbolize the religious freedom which allowed a Jew to serve in such a position of authority) and the other Reason (to symbolize the capitalism and labor efforts put forth by Straus). It was rededicated on October 26, 1998.

The Extra Mile – Points of Light Volunteer Pathway is a memorial in Washington D.C. Located adjacent to the White House, the monument is composed of 34 bronze medallions honoring people who "through their caring and personal sacrifice, reached out to others, building their dreams into movements that helped people across America and throughout the world". The medallions, each 42 inches in diameter, are embedded in sidewalks that form a one-mile walking path bounded by Pennsylvania Avenue, 15th Street, G Street, and 11th Street, NW. Each medallion includes a bas-relief likeness of one or more honorees, a description of their achievement and a quotation. The Extra Mile was founded by John A. Johansen in 1992. Planning and development for the monument were managed by the Make a Difference Foundation until its merger with the Points of Light Foundation in 2002. The Extra Mile memorial was dedicated on October 14, 2005 in a ceremony attended by President George H. W. Bush and Barbara Bush.

The John A. Wilson District Building, popularly known simply as the Wilson Building, houses the municipal offices and chambers of the Mayor and the Council of the District of Columbia. Originally called the District Building, it was renamed in 1994 to commemorate former Council Chair John A. Wilson. Completed in 1908, during the administration of 26th President Theodore Roosevelt, the building is a contributing structure to the Pennsylvania Avenue National Historic Site.

The 1977 Hanafi Siege occurred on March 9–11, 1977 when three buildings in Washington, D.C. were seized by 12 Hanafi Movement gunmen. The gunmen were led by Hamaas Abdul Khaalis, who wanted to bring attention to the murder of his family in 1973. They took 149 hostages. After a 39-hour standoff, the gunmen surrendered and all remaining hostages were released from the District Building (the city hall; now called the John A. Wilson Building), B'nai B'rith headquarters, and the Islamic Center of Washington. The gunmen killed 24-year-old Maurice Williams, a radio reporter from WHUR-FM, who stepped off a fifth-floor elevator into the crisis (the fifth floor is where the mayor and Council Chairmen have their offices). The gunmen also shot D.C. Protective Service Division police officer Mack Cantrell, who died in the hospital a few days later of a heart attack. Then-Councilman and future 4-term Washington, D.C. Mayor Marion Barry walked into the hallway after hearing a commotion and was hit by a ricocheted shotgun pellet, which lodged just above his heart. He was taken out through a window and rushed to a hospital. The gunmen had several demands. They wanted the government to hand over a group of men who had been convicted of killing seven relatives – mostly children – of takeover leader Hamaas Khaalis. They wanted those that were convicted of killing Malcolm X. They also demanded that the premiere of Mohammad, Messenger of God be canceled and the film destroyed because they considered it sacrilegious.Time magazine noted: That the toll was not higher was in part a tribute to the primary tactic U.S. law enforcement officials are now using to thwart terrorists—patience. But most of all, perhaps, it was due to the courageous intervention of three Muslim ambassadors, Egypt's Ashraf Ghorbal, Pakistan's Sahabzada Yaqub-Khan and Iran's Ardeshir Zahedi.

The National World War I Memorial is a national memorial commemorating the service rendered by members of the United States Armed Forces in World War I. The 2015 National Defense Authorization Act authorized the World War I Centennial Commission to build the memorial in Pershing Park, located at 14th Street and Pennsylvania Avenue NW in Washington, D.C. The park, which has existed since 1981, also contains the John J. Pershing General of the Armies commemorative work. In January 2016, the design commission selected the submission "The Weight of Sacrifice", by a team consisting of Joseph Weishaar, Sabin Howard, Phoebe Lickwar, and GWWO Architects, as the winning design, which is expected to be completed by 2024.On April 16, 2021, the flag was raised at the memorial and President Biden spoke at a virtual ceremony opening it to the public.

The Ronald Reagan Building and International Trade Center, named after former United States President Ronald Reagan, is located in downtown Washington, D.C., and was the first federal building in Washington designed for both governmental and private sector purposes. Each of the organizations located in the Pennsylvania Avenue building is dedicated to international trade and globalization. Organizations headquartered in this building include U.S. Customs and Border Protection, U.S. Agency for International Development, and the Woodrow Wilson International Center for Scholars. The first private sector lease was signed with investment banking firm Quarterdeck Investment Partners, Inc. The building hosts conferences, trade shows, cultural events, and outdoor concerts. Post-9/11, security requirements for high-profile federal buildings have limited the amount of public/private access anticipated by the center's designers.

The National Children’s Museum is a children's museum and science center in downtown Washington, D.C. It is intended to serve children up to age 12 and their families through interactive exhibits exploring science, technology, engineering, art, and math. Founded in 1974, the Museum operated from 1979 to 2004 at 220 H Street, NE. It then operated as a “museum without walls,” until 2009, when it opened a new location in National Harbor, Maryland. That closed in 2015. A new location opened on February 24, 2020, in the Ronald Reagan Building in downtown Washington, before temporarily closing due to the COVID-19 pandemic. The Museum reopened on September 2, 2021. The Museum’s mission is to inspire children to care about and change the world. The Museum received a U.S. Congressional designation in 2003 when Congress identified a need for a nationally recognized cultural and educational institution specifically for children.

The U.S. Capitol Gatehouses and Gateposts — designed circa 1827 by celebrated architect Charles Bulfinch — originally stood on the grounds of the United States Capitol in Washington, D.C. Two of the gatehouses are listed on the National Register of Historic Places in their new locations. One gatehouse and three of the gateposts now stand at 15th Street and Constitution Avenue within the President's Park South (PPS) historic district north of the National Mall. The other gatehouse is at 17th and Constitution, also within the PPS. Four other gateposts have been relocated to the main entrance of the National Arboretum at New York Avenue NE and Springhouse Road NE.

The General William Tecumseh Sherman Monument is an equestrian statue of American Civil War Major General William Tecumseh Sherman located in Sherman Plaza, which is part of President's Park in Washington, D.C., in the United States. The selection of an artist in 1896 to design the monument was highly controversial. During the monument's design phase, artist Carl Rohl-Smith died, and his memorial was finished by a number of other sculptors. The Sherman statue was unveiled in 1903. It is a contributing property to the Civil War Monuments in Washington, D.C. (added in 1978) and to the President's Park South (added in 1980), both of which are historic sites listed on the National Register of Historic Places.

The Hotel Washington is a historic hotel located at 515 15th Street NW (between Pennsylvania Avenue and F Street) in downtown Washington, D.C.

The Woodrow Wilson International Center for Scholars (or Wilson Center) is quasi-government entity and think tank which conducts research to inform public policy. Located in the Ronald Reagan Building and International Trade Center in Washington, D.C., it is a United States Presidential Memorial that was established as part of the Smithsonian Institution by an act of Congress in 1968. So-named for Woodrow Wilson's achievement of being the only President of the United States to hold a PhD, the center is also a think tank, ranked multiple times by the University of Pennsylvania's Think Tanks and Civil Societies Program as among the ten best in the world.On January 28, 2021, Mark Andrew Green was announced as the Wilson Center's next president, director and CEO. He began his term on March 15, 2021.