Median airfare: $724
Summer in Madrid can skew a little sultry, with average highs in July and August near 90 degrees. This is why organizers named the city’s biggest summer music festival Madrid Cool, which this year welcomes headliners Pearl Jam, Depeche Mode, and Queens of the Stone Age. If flying across the pond for rock concerts seems a little excessive, culture abounds in Madrid this summer as well. During the first two weeks of August, the San Cayetano, San Lorenzo, and La Paloma festivals hit the old town streets of Los Austrias and Lavapies, with music, dancing, and plenty of food. And for art lovers, the Prado will feature an exhibit called "Rubens, Painter of Sketches," devoted to Flemish artist Peter Paul Rubens.