Andrew W. Mellon Auditorium

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.

Murder Bay was a disreputable slum in Washington D.C. roughly bounded by Constitution Avenue NW, Pennsylvania Avenue NW, and 15th Street NW. The area was a center of crime through the early 20th century, with an extensive criminal underclass and prostitution occurring in several brothels and hotels in the area. The area was completely rebuilt during the construction of the Federal Triangle project in the late 1920s and 1930s.

Bearing Witness is an outdoor 1997 sculpture by Martin Puryear, installed outside the Ronald Reagan Building and International Trade Center in Washington, D.C., in the United States.

Federal Triangle Flowers is an outdoor 1998 sculptural work by Stephen Robin, installed in Woodrow Wilson Plaza, between the Ariel Rios Building and the Ronald Reagan Building and International Trade Center, in Washington, D.C., United States. The installation includes two pieces, one depicting a single stem rose and the other a lily. The cast-aluminum sculptures are set on limestone pedestals; both flowers measure approximately 10 feet (3.0 m) x 14 feet (4.3 m) x 7 feet (2.1 m).

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 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.

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 William Jefferson Clinton Federal Building is a complex of several historic buildings located in the Federal Triangle in Washington, D.C., across 12th Street, NW from the Old Post Office. The complex now houses the headquarters of the Environmental Protection Agency (EPA). One component of the complex was originally called the New Post Office, and housed the headquarters of the Post Office Department until that department was replaced by the United States Postal Service in 1971 and which vacated the building. Subsequently, the Bureau of Alcohol, Tobacco, Firearms and Explosives (BATFE) occupied this building, which Congress renamed as the Ariel Rios Federal Building in 1985. BATFE vacated the building in the early 1990s, and EPA moved in after a renovation. To consolidate its headquarters offices, EPA also took occupancy of two adjacent buildings beginning in the late 1990s: the Interstate Commerce Commission (ICC) building and the Department of Labor Building, on Constitution Avenue, NW. In 2013 Congress renamed the Ariel Rios Federal Building in honor of former President Bill Clinton, and the General Services Administration extended the designation to the former ICC and Labor buildings. (The new BATFE headquarters building received the name Ariel Rios Federal Building in 2016.)

The Environmental Protection Agency (EPA) is an independent executive agency of the United States federal government tasked with environmental protection matters. President Richard Nixon proposed the establishment of EPA on July 9, 1970; it began operation on December 2, 1970, after Nixon signed an executive order. The order establishing the EPA was ratified by committee hearings in the House and Senate. The agency is led by its administrator, who is appointed by the president and approved by the Senate. The current administrator is Michael S. Regan. The EPA is not a Cabinet department, but the administrator is normally given cabinet rank. The EPA has its headquarters in Washington, D.C., regional offices for each of the agency's ten regions, and 27 laboratories. The agency conducts environmental assessment, research, and education. It has the responsibility of maintaining and enforcing national standards under a variety of environmental laws, in consultation with state, tribal, and local governments. It delegates some permitting, monitoring, and enforcement responsibility to U.S. states and the federally recognized tribes. EPA enforcement powers include fines, sanctions, and other measures. The agency also works with industries and all levels of government in a wide variety of voluntary pollution prevention programs and energy conservation efforts. In 2021, the agency had 14,297 employees. More than half of EPA's employees are engineers, scientists, and environmental protection specialists; other employees include legal, public affairs, financial, and information technologists. Many public health and environmental groups advocate for the agency and believe that it is creating a better world. Other critics believe that the agency commits government overreach by adding unnecessary regulations on business and property owners.

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.

Federal Triangle is an island-platformed Washington Metro station in Washington, D.C., United States. The station was opened on July 1, 1977, and is operated by the Washington Metropolitan Area Transit Authority (WMATA). Providing service for the Blue, Orange, and Silver Lines, the station's entrance is beneath the William Jefferson Clinton Federal Building.

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.