The National Portrait Gallery, which also houses the American Art Museum, is just one block east of our wedding venue. It's open daily 11:30am to 7pm and has free admission.
This new museum is incredibly well-done, and there's a lot to see. It's open 10am to 5:30pm, but you will have to secure free entry passes in advance through its website.
The East Wing (modern art) was recently renovated, and the Sculpture Garden makes a great picnic spot. It's open 10am to 5pm and has free admission.
From the Lincoln Memorial, the memorials for MLK, Vietnam War, Korean War, and WWII are a close walk. The Jefferson Memorial is a farther walk around the Tidal Basin.