Guernica by Pablo Picasso in Museo Reina Sofia, Madrid.
A painting that Picasso made after the terrible bombing of the little town Guernica in Northern Spain by German and Italian warplanes at the behest of the Spanish Nationalist forces during the Spanish Civil war. While living in Nazi-occupied Paris during World War II, Picasso suffered harassment from the Gestapo. One officer allegedly asked him, upon seeing a photo of Guernica in his apartment, "Did you do that?" Picasso responded, "No, you did."