Flickr User Jakedobkin has uploaded a collection of images taken in the Freedom Tunnel [wiki].
Among the dozens of photos is this one that attracted me, because I'm against graffitis but never ever thought that one of those supposed artists could have known about the Francisco de Goya [wiki] picture, painted after the rebellion of Madrid against the French invadors in 1812, on the shooting of some patriotic civilians. The picture is called The Third of May 1808 [wiki].
The Third of May 1808 picture is part of a series on the Independence War, and follows The Second of May 1808 [wiki] in which you can see the rebellion against France.
Please ignore the stupid bastard who made the additional yellow graffiti painting on it :(