Visiting the Netherlands
I would say you need to go one a minimum of one each of:
art museum (preferably old art/bigger museum but the Escher museum is pretty cool too)
WWII thing (Anne Frank or Corrie ten Boom houses, as discussed)
old church (it's some solid local history and architecture even if you don't care about the religious bit)
castle (depending where you end up that might be a bit harder)
And try consuming:
fries with satay peanut sauce and mayo, called "patat orloog" which means "fry war"
frikandel speciaal
haring (herring)