The question is not what to do in D.C. but what not to do! The possibilities are limitless and there is something for everyone. Museums, Monuments, parks and open space, not to mention the home of the White House and the U.S. Capitol. There may be no better known collection of museums than the Smithsonian Institution, and all located in one city. Popular venues among the Smithsonian include the National Air and Space Museum, the National Portrait Gallery, and the beautiful National Zoo. While the museums still remain closed, the garden and outdoor spaces are open to the public. Scroll down for the full list.