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.