National Museum of African American History and Culture

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.

In America: Remember was a public art installation by American artist Suzanne Brennan Firstenberg. The exhibition, on display from September 17 to October 3, 2021, in Washington, D.C., honored Americans who died in the COVID-19 pandemic by blanketing a portion of the National Mall near the Washington Monument with over 600,000 small white flags, one for each life lost. The number of flags rose to 701,133 by the end of the exhibition, reflecting the updated death toll.

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.

George Washington, also known as Enthroned Washington, is a large marble sculpture by Horatio Greenough commissioned by the United States Congress on July 14, 1832 for the centennial of U.S. President George Washington's birth on February 22, 1732. Completed in 1840, the statue was soon exhibited in the Rotunda of the United States Capitol and then moved to the Capitol's east lawn in 1843. Since 1964 it has been in the National Museum of American History. Horatio Greenough based Enthroned Washington on Phidias' great statue of Zeus Olympios, one of the Seven Wonders of the Ancient World and destroyed in Late Antiquity.

The Department of Labor Building, also known as the William Jefferson Clinton Federal Building, is a historic office building, located at 14th Street, and Constitution Avenue, Northwest, Washington, D.C., in the Federal Triangle. It was the headquarters building for the United States Department of Labor from its opening until the 1970s. It later housed the U.S. Customs Service, and is currently occupied by the U.S. Environmental Protection Agency (EPA).

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 National Museum of American History: Kenneth E. Behring Center collects, preserves, and displays the heritage of the United States in the areas of social, political, cultural, scientific, and military history. Among the items on display is the original Star-Spangled Banner. The museum is part of the Smithsonian Institution and located on the National Mall at 14th Street and Constitution Avenue NW in Washington, D.C.

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 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.

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.

USS Philadelphia is a gunboat (referred to in contemporary documents as a gundalow or gondola) of the Continental Navy. She was constructed from July-August 1776 for service during the American Revolutionary War. Manned by Continental Army soldiers, she was part of a fleet under the command of General Benedict Arnold that fought against the British Royal Navy in the Battle of Valcour Island on Lake Champlain. Philadelphia was sunk during the battle on 11 October 1776. In 1935, amateur military marine archaeologist Lorenzo Hagglund located her remains standing upright at the bottom of Lake Champlain. The wreck was raised to the surface and salvaged. In 1961 she was bequeathed to the Smithsonian Institution. Philadelphia and associated artifacts are now part of the permanent collection of the National Museum of American History, in Washington, D.C., where curator Philip K. Lundeberg was responsible for arranging her initial display. The vessel is listed on the National Register of Historic Places and is a National Historic Landmark.

The Federal Triangle is a triangular area in Washington, D.C. formed by 15th Street NW, Constitution Avenue NW, Pennsylvania Avenue NW, and E Street NW. Federal Triangle is occupied by 10 large city and federal office buildings, all of which are part of the Pennsylvania Avenue National Historic Site. Seven of the buildings in Federal Triangle were built by the U.S. federal government in the early and mid-1930s as part of a coordinated construction plan that has been called "one of the greatest building projects ever undertaken" and all seven buildings are now designated as architecturally historic. The Federal Triangle Washington Metro station serves Federal Triangle and the surrounding area.