This is off the beaten tourist path, but it is one of the best places to go in Madrid. If you enjoy art, and need a break from the overwhelming Prado and Reina Sofia, Sorolla's house is beautiful and his paintings are unparalleled. When you go to this museum it seems as if you have stepped back into the time when Sorolla was painting and selling his art from his house. I would come here everyday if I could. If you have more than 2 days in Madrid, the Museo Sorolla should definitely be on your list of things to see!
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