Washington, D.C.

Washington, D.C. is the capital city of the USA.

History
Bart had a dream about the White House in Washington, D.C. where the constitution was being signed.

The Simpson family won a trip to Washington, D.C. because of Lisa's speeches. They stayed in a fancy hotel, The Watergate and visited the White House, The National Air and Space Museum and the Washington Monument.

Non-canon
The Lewis and Clark expedition passed through Washington, D.C., passing by the White House.