White House
From Tardis Wiki, the free Doctor Who reference
The White House, located in Washington, D.C., was the residence of the President of the United States and a seat of the American government.
On Christmas Day 2009, President Barack Obama was giving a speech from the White House when, like everyone else on the planet, he was converted into a copy of the Master. (DW: The End of Time)
During the Orion War, the President of Earth was based in the White House. (BFC: Scorpius, Fear, Conversion)
