Washington, D.C., formally known as the District of Columbia, is the capital city of the United States. It is not a state, but a federal district that was created to serve as the nation's capital from a land donated by the states of Maryland and Virginia. The city is named after George Washington, the first President of the United States, and Christopher Columbus. It is home to all three branches of the U.S. federal government, including the Congress, the President, and the Supreme Court. Washington, D.C., also hosts 177 foreign embassies as well as the headquarters of many international organizations, trade unions, non-profits, lobbying groups, and professional associations. The architecture in Washington, D.C., is a mix of neoclassical, Georgian, gothic, and modern influences, with landmarks such as the White House, the Capitol Building, the Supreme Court, and the Washington Monument. The city is divided into quadrants with the Capitol Building at the center, making navigation relatively straightforward. The National Mall is a large, open park in downtown Washington, D.C., and is the location of many monuments and museums, which are part of the Smithsonian Institution. The city's extensive museum collection and regular cultural events reflect its status as a hub of history and art. Washington, D.C., is known for its vibrant and diverse neighborhoods, such as Georgetown with its historic charm, Dupont Circle for its cultural diversity, and Capitol Hill with its political significance. The city's dining scene is equally diverse, offering everything from food trucks and casual eateries to upscale dining experiences. The city also has a lively nightlife with numerous bars, clubs, and concert venues. The city's economy is primarily based on the federal government, but it also has growing sectors in education, finance, public policy, and scientific research. The presence of the federal government has shielded the local economy from some of the fluctuations seen in other parts of the country. Washington, D.C., is served by a network of public transportation options, including the Washington Metro, buses, and a bike-sharing program, which make it relatively easy to get around without a car. The city also has several parks and recreational areas, such as Rock Creek Park, which provide residents and visitors with green space and outdoor activities within the urban environment.