Washington, D.C. is the seat of government in the United States and the place where American history is made. This busy city, which is technically a Federal district, has been the capital of the United States since 1791. Over 600,000 people live in D.C., but the population balloons to over a million during the workweek, when people come from nearby suburbs to do the business that keeps the country running.
With so many people in such a small area, it's a good thing that Washington, D.C. has a state-of-the-art public transportation system. The Metrorail gives residents of Washington and its suburbs easy access to the city center, and Metrobus takes people on shorter trips around the capital. Traffic can be quite congested, so many people forgo their cars in favor of public transport and taxis. Walking is also a popular means of transportation in D.C., and the city ranks number seven in the nation for walkability.