I love museums but we tend to do more outdoorsy things. Loved the Louvre in Paris...we didn't get through the whole thing but it was fun.
Loved all the Smithsonian ones in DC esp one that showed the Presidents and first ladies...Abe Lincoln's hat, the inaugural dresses and White House China
We also enjoyed visiting the birth homes of presidents: Mount Vernon, Monticello, LBJ ranch. Cool places.
Anything history I love!