What are the best things to see in Washington DC?

National Mall: The National Mall is a large park in downtown Washington, D.C., that serves as the location of many of the most iconic landmarks in the nation's capital. It includes the Lincoln Memorial, the Washington Monument, the World War II Memorial, the Korean War Veterans Memorial, and the Vietnam War Memorial.

White House: The White House is the official residence and workplace of the President of the United States. It is located at 1600 Pennsylvania Avenue NW in Washington, D.C.

Capitol Building: The Capitol Building is the home of the U.S. Congress and a must-see for any visitor to Washington, D.C. The domed building is located on Capitol Hill and is open to the public for tours.

Supreme Court Building: The Supreme Court Building is the home of the Supreme Court of the United States and is located on Capitol Hill in Washington, D.C. The building is open to the public for tours.

Smithsonian Institution: The Smithsonian Institution is the world's largest museum and research complex, with 19 museums and galleries and the National Zoo. The museums and galleries are free to visit, and many of them are located on the National Mall.

National Air and Space Museum: The National Air and Space Museum is one of the most popular museums in the world and is a must-see for anyone interested in aviation or space exploration. The museum is home to a collection of over 600 aircraft and spacecraft, including the original Wright Flyer and the Apollo 11 Lunar Module.

International Spy Museum: The International Spy Museum is a museum dedicated to the history of espionage. The museum is home to a collection of spy artifacts, including weapons, gadgets, and disguises.

Newseum: The Newseum is a museum dedicated to the history of journalism and the First Amendment. The museum is home to a collection of news artifacts, including newspapers, photographs, and television news clips.

Holocaust Memorial Museum: The Holocaust Memorial Museum is a museum dedicated to the memory of the victims of the Holocaust. The museum is home to a collection of artifacts and exhibits that tell the story of the Holocaust.

Arlington National Cemetery: Arlington National Cemetery is a military cemetery located in Arlington, Virginia, just across the Potomac River from Washington, D.C. The cemetery is the final resting place for over 400,000 military veterans, including many who died in the Civil War, World War I, and World War II.