many famous, important, and valuable works of art are in these museums. for example, the queen sofia museum has a famous painting by pablo picasso, called "guernica". picasso painted this painting to show how sad and angry it made him when the german nazis destroyed a town in spain called guernica in 1937. picasso had said that the painting should never return to spain until it was a democracy again. once that happened, they built the queen sofia museum just to have a good place to put it.