Museo Nacional del Prado, Spain's art benchmark, is one of the world's top four museums and the most comprehensive and authoritative collection of Spanish paintings. The weekday ticket is 14 Euros per person, but there is free time to visit, which I think Madrid is better than other Spanish cities. Many famous museums have free time. Free admission time is: 18:00-20:00 (Monday-Saturday); 17:00-19:00 (Sunday and Holiday); May 18 (International Museum Day), October 12 (Spanish National Day), November 19 (Prado Museum Day) 18:00 free admission, but basically 17:00 is good to go to the queue, we arrived at 17:30, in front of a long line. The Prado Museum is like a window to see Spain's peculiar soul since ancient times. The Museum has a large collection of works by Spanish painters: Bosk's masterpieces, Picasso's paintings and almost all of Goya's masterpieces. Unfortunately, the interior can not take photos, only their own eyes.