DISTRICT OF COLUMBIA

a federal area in the eastern United States coextensive with the federal capital, Washington.

Pierre Charles L'Enfant
planner of Washington, D.C.

U.S. Capitol
the seat of the federal government

Lincoln Memorial
a monument to the 16th President of the United States

Washington Monument
an obelisk built in honor of the first President of the United States

White House
the official residence of the President of the United States