High-tech storage dungeons and the cultural treasures hidden inside

<p>Freeports are the most expensive and secretive warehouses in the world, which now hide some of the world’s cultural treasures from the public eye.</p> <p>Join Ben Brock Johnson as he traces the path of one lost Modigliani painting, "Seated Man with a Cane," and attempts to catch a glimpse inside these high-tech storage dungeons.</p>