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.

Who and what were the knights? How did they live? We go back to the days of castles, armor, sword fights and jousts to find out.

January 1943: Admiral Karl Dönitz, head of the Nazis’ U-boat fleet, has brought Britain to the brink of starvation by ruthlessly destroying close to a thousand of their merchant ships….

The most detailed documentary about the Battle of Berlin. Follow the battle day by day with this 18-part series.