Washington D. C. Aerial infrared image of Washing- ton,District of Columbia (D. C. ),the capital city of the United States of America. North is at top right. In the infrared range green vegetation appears red,buildings are grey and water is blue/black. The city lies at the confluence of the Potomac (upper left) and Anacostia (lower right) rivers. The American President's residence,the White House,is at upper left,whilst the parliament building,the Capitol,is at centre. The largest office building in the world,the Pentagon (at far left),houses the Department of Defense. The major rail terminus at centre right is Union Station |