I did not have this on my "must do" list while visiting DC, but thoroughly enjoyed this museum. I learned a lot too. The museum displays documents and tells the stories of important times in our history- independence from the ties of England, equal rights for women, military details from D-day and documents on the abolition of slavery to name a few. There are letters, political papers, logs and journals as well as interactive exhibits and video presentations. Information is provided on their methods for document preservation as well. The area where the Declaration of Independence and Constitution are kept is elegant and awe inspiring with sweeping ceilings, marble floors and artwork which really creates a sense of reverence. We went on a day when there was no line, but you can reserve a spot in advance for a convenience fee of $1 per ticket. There are tours once a day at 9 AM I believe, but need to be reserved in advance and fill quickly.