I love walking the National Mall. You can spend the whole day leisurely walking gardens, view monuments, and visiting museums. It's a very historic, and patriotic place to visit. I am Canadian yet I felt a strong sense of pride each time I visited the National Mall. When in DC it is a place that should not be missed. The Lincoln Memorial is my favourite, when you stand at the top the steps and look out over the mall it is breathtaking.
Don't miss it
*i have not been to DC since 2011 but the review page would not go back that far*.