<p>A tapestry of Pablo Picasso's powerful anti-war tableau "Guernica" has hung outside the U.N. Security Council since 1985, and it would be difficult to imagine a more fitting example of site-specific art.</p>
<p>The original 1937 painting depicts the terrorized and dying civilians at Guernica, a small Basque village in northern Spain that Generalissimo Francisco Franco's Nationalist regime, battling the Republican government during the Spanish Civil War, allowed the German air force to use for target practice. About 1,600 civilians were killed or wounded in three hours of bombardment.</p>