The headquarters for all of the United States Military. Odd that this isn't 'fuzzed out' like The Capital or 'brown roofed' like The White House.
Zooming in on the western 'leg' you can see a large amount of what appears to be construction materials and other debris.
Someone told me that this is the residence of The Vice President of The United States - currently **** Cheney. Whatever it is, it must be important because GEarth and Google Maps both have it blurred out beyond all recognition.
Here is The White House - notice how the details of the roof have been completely removed. The roofs of the executive building to the east and west of The White House also have all roof details removed. Even the courtyards inside the executive buildings have been blurred. The same thing happens using Google Maps.
This is the Kremlin compound in Moscow, Russia. The green roofed four sided odd shape building at the top contain the offices. (Tidbit - a photograph I took in 1996 hangs in one of those offices!) The black triangular building is kind of a museum/public information area. The placemark is in the courtyard of four beautiful churches. Above the Kremlin compound you can see Red Square.