Washington, D.C., formally the District of Columbia and commonly referred to as "Washington", "the District", or simply "D.C.", is the capital of the United States.The signing of the Residence Act on July 16, 1790, approved the creation of a capital district located along the Potomac River on the country's East Coast. The U.S. Constitution provided for a federal district under the exclusive jurisdiction of the Congress and the District is therefore not a part of any U.S. state.Washington is home to many national monuments and museums, which are primarily situated on or around the National Mall.The city hosts 176 foreign embassies as well as the headquarters of many international organizations, trade unions, non-profit organizations, lobbying groups, and professional associations.The National Mall is a large, open park in downtown Washington between the Lincoln Memorial and the United States Capitol.Given its prominence, the mall is often the location of political protests, concerts, festivals, and presidential inaugurations.The Washington Monument and the Jefferson Pier are near the center of the mall, south of the White House. Also on the mall are the National World War II Memorial at the east end of the Lincoln Memorial Reflecting Pool, the Korean War Veterans Memorial, and the Vietnam Veterans Memorial.Directly south of the mall, the Tidal Basin.The Franklin Delano Roosevelt Memorial, George Mason Memorial, Jefferson Memorial, Martin Luther King, Jr. Memorial, and the District of Columbia War Memorial are around the Tidal Basin. Library of Congress is the largest library complex in the world with a collection of over 147 million books, manuscripts, and other materials.The Smithsonian American Art Museum and the National Portrait Gallery are housed in the Old Patent Office Building, near Washington's Chinatown.The Renwick Gallery is officially part of the Smithsonian American Art Museum but is in a separate building near the White House.Other Smithsonian museums and galleries include: the Anacostia Community Museum in Southeast Washington; the National Postal Museum near Union Station; and the National Zoo in Woodley Park.Washington, D.C., is a national center for the arts. The John F. Kennedy Center for the Performing Arts is home to the National Symphony Orchestra, the Washington National Opera, and the Washington Ballet.