The imposing bunkers and military structures of San Francisco's Presidio once held munitions, but for the next few months they will hold art. The exhibit, titled "Homeland Security" is organized by the same non-profit that brought Ai Weiwei's work to Alcatraz in 2014. This project brings together the works of 18 artists from 12 countries to consider the human costs of war, borders and security. Forum talks with the exhibit's curator, some of the artists featured and a national parks official about the unique collaboration.
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