Washington D.C., the capital of the United States, is on the bank of Potomac River, Maryland. The area of the city is 176 square kilometers and the population is 628 thousand. It was set up as new capital in 1790, and the capital moves from Parliament to Washington, D.C. In 1800. British army occupied it in 1814 and burnt the Parliament house and residence of the President. After reconstruction for several times and construction in the 20th century, it became a modern city. As the capital, it’s the political and cultural center or the U.S. It’s also where the government is located and international convention (会议) is held. The congress Building is in the center of Washington, D.C. White house, the residence of the President of the U.S. is on Pennsylvania Street, not far away the Congress. It’s open to the public every Sunday and is the only residence of the chief of state that opens to the public in the world. Every year it receives around 1.5 million visitors. There are hundreds of historic building, monuments and states in Washington, D.C., such as Washington Monument, Lincoln Memorial Hall, Jefferson Memorial Hall, National Museum, Art Gallery and Congress Library. JFK Center built in 1971 consists of opera, theater, auditorium and ballet showplace. Now Washington, D.C. Is a tourist city welcoming tourist from all over the world.