And it’s hard not to shoot the Washington Monument. It’s the tallest structure in D.C.
But there are many more photogenic locations in D.C. Union Station, the train station a few blocks from the Capitol, provides a plethora of potential architectural photos, as does the Library of Congress that stands behind the Capitol. The Lincoln Memorial can also provide interesting opportunities, especially early in the morning before the crowds arrive. And I’ve always enjoyed visiting — and photographing — the various Smithsonian museums and Arlington Cemetery.
As is typical when I'm shooting in a city, I carry a variety of shorter lenses when I'm in D.C. I seldom find the need for telephoto lenses.