In 1973, 591 American POWs returned home from the Vietnam War, bringing with them harrowing tales of survival. But there was an even more remarkable — and secret — story…

From garbage trucks to power plants, giving viewers a rare behind-the-scenes look into the sprawling network of infrastructure systems that keep New York City breathing.

Witness the 20-year, billion-dollar hunt for the Al-Qaeda leader, as told by the main players who finally brought him down.