Anyone been to Washington DC?

I’m staying with my family in Washington DC for 3 days and I was just wondering which places there were “must sees”. Is the list below good, and what should I add/change?

1. US Holocaust Memorial Museum
2. National Museum of American History (Smithsonian)
3. National Museum of Natural History (Smithsonian)
4. National Children’s Museum
5. Vietnam Veteran’s Memorial
6. 9/11 Memorial
7. White House, Washington monument
8. Arlington House
9. FDR, Jefferson, and Lincoln Memorials

All help is welcome!

THANKS SO MUCH!!

We went to # 1, # 2, # 3, # 5, # 7, # 9

This was the year before 9/11 so that wasn’t there.
I don’t know what Arlington House is.

We also went to Arlington National Cemetery (Kennedy graves).
We saw the changing of the guards at the tomb of the unknown soldier
— don’t miss that.
We went to Fords Theater where Lincoln was shot.
We went to the Pentagon, the Capitol, and the Supreme Court
We went to the Bureau of Printing & Engraving to watch them print
money.