Picasso's 3.5-by-7.8-metre scream about the bombing of a Basque town, in the Reina Sofia.
Diego Rivera's repainting of the mural Rockefeller destroyed, in the Palacio de Bellas Artes.
A 1.3-km stretch of the Berlin Wall painted by artists in 1990 — including the famous Brezhnev–Honecker kiss.
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