The largest building (in terms of area) is the Washington Convention Center.
The tallest building is the Washington Monument.
These are some of the most famous buildings in the world:
The Whitehouse
The US Capital Building
The Air and Space Museum
PNC Bank, Farmers and Mechanics Branch in the Georgetown neighborhood.
You can see a model of it in LEGO blocks on the legoland miniland Washington DC wikipedia page.
The United States Capitol Building. Not the white house, but the building with the big dome in Washington DC. The US Capitol in Washington DC.
Washington, DC
Do you mean the capitol building in Washington DC?
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the Pentagon....in Washington dc
Washington DC
The Pentagon.
The US Capitol Building in Washington, DC
The capital building in Washington DC was designed by Dr William Thornton. The plan had three sections to house the House of Representatives, Congress as well as the main building.
The Capitol Building. (Note that Washington DC is the 'capital' of the US.)
Capital building in Washington DC.
Capitol building