Engineered by William Barclay Parsons, the 21-mile, four-track route of the New York City Subway was the largest public works project in history.
Two days in 1967 revealed a nation divided over a war that continues to haunt us.
The internationally famous carnival of delights in New York was the birthplace of the hot dog and the roller coaster.
From the Revolutionary War to Operation Desert Storm - newly discovered letters read by celebrity actors tell of courage, longing, and sacrifice.
In the Philippines, Army Rangers liberated 513 prisoners of war three years after the Bataan Death March.
The unusual life of David Vetter, who lived permanently inside a germ-free environment due to severe combined immunodeficiency.
Postwar New York City and the global economic order told through the story of the World Trade Center.
With over a million already dead, heroic American soldiers and nurses served in the closing battles of World War I.