Agree completely with National Archives and would add one small secondary exhibit that does not get much attention but is quite moving (assuming it is still there). They have a video of a US POW from Vietnam (i am pretty sure Vietnam and not Korea) who was forced to go on television and say that he was being treated well, etc. However, the whole time he is saying that he is also blinking morse code with his eyelids spelling out -----T--------O------R-------T------U-----R------E-------

My favorite thing to do in Washington which i am fortunate enought to do 3 or 4 times a week is to go for a run at sunrise on the mall down to Lincoln and back up and around Capitol Hill.