In America: Remember

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 National Museum of African American History and Culture (NMAAHC) is a Smithsonian Institution museum located on the National Mall in Washington, D.C., in the United States. It was established in December 2003 and opened its permanent home in September 2016 with a ceremony led by President Barack Obama. Early efforts to establish a federally owned museum featuring African-American history and culture can be traced to 1915, although the modern push for such an organization did not begin until the 1970s. After years of little success, a much more serious legislative push began in 1988 that led to authorization of the museum in 2003. A site was selected in 2006, and a design submitted by Freelon Group/Adjaye Associates/Davis Brody Bond was chosen in 2009. Construction began in 2012 and the museum completed in 2016. The NMAAHC is the world's largest museum dedicated to African-American history and culture. It ranked as the fourth most-visited Smithsonian museum in its first full year of operation. The museum has more than 40,000 objects in its collection, although only about 3,500 items are on display. The 350,000-square-foot (33,000 m2), 10 story building (five above and five below ground) and its exhibits have won critical praise.

The German-American Friendship Garden on the National Mall in Washington, D.C. stands as a symbol of the positive and cooperative relations between the United States of America and the Federal Republic of Germany. Situated within the Washington Monument grounds on the historic axis between the Jefferson Pier and the White House (see White House meridian), the garden borders Constitution Avenue Northwest between 15th and 17th Streets Northwest, where an estimated seven million visitors pass each year. The garden features plants native to both Germany and the United States and provides seating and cooling fountains.

On November 11, 2011, Oscar Ramiro Ortega-Hernandez, an unemployed 21-year-old man, fired multiple shots at the White House using a semi-automatic rifle. At least seven bullets hit the second floor. Neither the President Barack Obama nor First Lady Michelle Obama were home at the time; the president was not in Washington, D.C., having been on a trip abroad. However, the couple's youngest daughter, Sasha, and the first lady's mother, Marian Shields Robinson, were in the White House. No one was injured. It took four days for the Secret Service to realize that bullets had struck the White House. Michelle Obama learned of the shooting from an usher, then summoned Mark J. Sullivan, director of the Secret Service, to find out why the first family had not been informed. In September 2013, Ortega-Hernandez pleaded guilty to one count of property destruction and one count of discharging a firearm during a crime of violence, thereby avoiding being charged with an attempt to assassinate the President. In March 2014, he was sentenced to 25 years' imprisonment. In September 2014, The Washington Post published an investigative report detailing errors that the Secret Service made on the night of the shooting that led to the crime going undiscovered. A House of Representatives hearing followed and Julia Pierson, director of the Secret Service, resigned the following week. It was the first shooting at the White House since Francisco Martin Duran's attempted assassination of President Bill Clinton in 1994.

The Washington Monument is an obelisk within the National Mall in Washington, D.C., built to commemorate George Washington, once commander-in-chief of the Continental Army (1775–1784) in the American Revolutionary War and the first President of the United States (1789–1797). Located almost due east of the Reflecting Pool and the Lincoln Memorial, the monument, made of marble, granite, and bluestone gneiss, is both the world's tallest predominantly stone structure and the world's tallest obelisk, standing 554 feet 7+11⁄32 inches (169.046 m) tall according to the U.S. National Geodetic Survey (measured 2013–14) or 555 feet 5+1⁄8 inches (169.294 m) tall, according to the National Park Service (measured 1884). It is the tallest monumental column in the world if all are measured above their pedestrian entrances. Overtaking the Cologne Cathedral, it was the tallest structure in the world between 1884 and 1889, after which it was overtaken by the Eiffel Tower in Paris. Construction of the presidential memorial began in 1848 and was halted for a period of 23 years, from 1854 to 1877 due to a lack of funds, a struggle for control over the Washington National Monument Society, and the American Civil War. Although the stone structure was completed in 1884, internal ironwork, the knoll, and installation of memorial stones were not completed until 1888. A difference in shading of the marble, visible approximately 150 feet (46 m) or 27% up, shows where construction was halted and later resumed with marble from a different source. The original design was by Robert Mills (1781–1855) of South Carolina, but he did not include his proposed colonnade due to a lack of funds, proceeding only with a bare obelisk. The cornerstone was laid on July 4, 1848; the first stone was laid atop the unfinished stump on August 7, 1880; the capstone was set on December 6, 1884; the completed monument was dedicated on February 21, 1885; and officially opened October 9, 1888. The Washington Monument is a hollow Egyptian style stone obelisk with a 500-foot (152.4 m) tall column surmounted by a 55-foot (16.8 m) tall pyramidion. Its walls are 15 feet (4.6 m) thick at its base and 1+1⁄2 feet (0.46 m) thick at their top. The marble pyramidion has thin walls only 7 inches (18 cm) thick supported by six arches, two between opposite walls that cross at the center of the pyramidion and four smaller corner arches. The top of the pyramidion is a large marble capstone with a small aluminum pyramid at its apex with inscriptions on all four sides. The lowest 150 feet (45.7 m) of the walls, constructed during the first phase 1848–1854, are composed of a pile of bluestone gneiss rubble stones (not finished stones) held together by a large amount of mortar with a facade of semi-finished marble stones about 1+1⁄4 feet (0.4 m) thick. The upper 350 feet (106.7 m) of the walls, constructed during the second phase 1880–1884, are composed of finished marble surface stones, half of which project into the walls, partially backed by finished granite stones.The interior is occupied by iron stairs that spiral up the walls, with an elevator in the center, each supported by four iron columns, which do not support the stone structure. The stairs contain fifty sections, most on the north and south walls, with many long landings stretching between them along the east and west walls. These landings allowed many inscribed memorial stones of various materials and sizes to be easily viewed while the stairs were accessible (until 1976), plus one memorial stone between stairs that is difficult to view. The pyramidion has eight observation windows, two per side, and eight red aircraft warning lights, two per side. Two aluminum lightning rods, connected via the elevator support columns to ground water, protect the monument. The monument's present foundation is 37 feet (11.3 m) thick, consisting of half of its original bluestone gneiss rubble encased in concrete. At the northeast corner of the foundation, 21 feet (6.4 m) below ground, is the marble cornerstone, including a zinc case filled with memorabilia. Fifty American flags fly on a large circle of poles centered on the monument. In 2001, a temporary screening facility was added to the entrance to prevent a terrorist attack. An earthquake in 2011 slightly damaged the monument, and it was closed until 2014. It was closed again for elevator system repairs, security upgrades, and mitigation of soil contamination from August 2016 to September 2019.

Jefferson Pier, Jefferson Stone, or the Jefferson Pier Stone, (pronounced pie-er, like radials of a pie) in Washington, D.C., marks the second prime meridian of the United States even though it was never officially recognized, either by presidential proclamation or by a resolution or act of Congress.

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 Ellipse (sometimes referred to as President's Park South) is a 52-acre (21 ha) park south of the White House fence and north of Constitution Avenue and the National Mall in Washington, D.C. The Ellipse is also the name of the five-furlong (1.0 km) circumference street within the park. The entire park, which features monuments, is open to the public and is part of President's Park. The Ellipse is the location for many annual events.

The Herbert C. Hoover Building is the Washington, D.C. headquarters of the United States Department of Commerce. The building is located at 1401 Constitution Avenue, Northwest, Washington, D.C., on the block bounded by Constitution Avenue NW to the south, Pennsylvania Avenue NW to the north, 15th Street NW to the west, and 14th Street NW to the east. It is located in the Federal Triangle, east of President's Park South (the Ellipse), north of the National Mall, and west of other Department of Commerce buildings, the John A. Wilson Building (District Building with the government of the District of Columbia / Washington, D.C.), and the Ronald Reagan Building. The building is owned by the General Services Administration. Completed in 1932, it was renamed after Herbert Hoover in 1981. Hoover served as Secretary of Commerce (1921–1928) and later President (1929–1933). The closest Washington Metro station is Federal Triangle. The White House Visitor Center (on the first floor) is in the Hoover Building.

14th Street NW/SW is a street in Northwest and Southwest quadrants of Washington, D.C., located 1.25 miles (2.01 km) west of the U.S. Capitol. It runs from the 14th Street Bridge north to Eastern Avenue. Northbound U.S. Route 1 runs along 14th Street from the bridge to Constitution Avenue, where it turns east with US 50. US 1 southbound previously used 15th Street NW due to the ban on left turns from westbound Constitution Avenue to 14th Street, but it now uses the Ninth Street Tunnel, five blocks to the east. 14th Street crosses the National Mall and runs near the White House and through the western side of Washington's Logan Circle neighborhood. Because it connects to one of the main bridges crossing the Potomac River into Virginia, 14th Street has always been a major transportation corridor. It was the location of one of the first streetcar lines, and today it is the location of several afternoon carpooling "slug lines", which allow commuters to meet the high-occupancy vehicle requirements of I-395, the Henry G. Shirley Memorial Highway.

The Second Division Memorial is located in President's Park, between 17th Street Northwest and Constitution Avenue in Washington, DC, United States. The Memorial commemorates those who died, while serving in the 2nd Infantry Division of the U. S. Army. The artist was James Earle Fraser. It was dedicated on July 18, 1936, by president Franklin D. Roosevelt.It was rededicated in 1962, by Gen. Maxwell Taylor, with two wings added for the battle honors of World War II and the Korean War. The flaming sword symbolizes the defense of Paris from the German advance.

Ripps Island was an island located in the Potomac River in the northwest quadrant of Washington, D.C., in the United States. It was located at the mouth of Tiber Creek, in the vicinity of today's Constitution Gardens.