Undercover History

Police closed the case of the infamous Boston Strangler when Albert De Salvo confessed to the murder of 13 women. Recent forensic evidence reveals that in at least one of the murders police may have had the wrong man.

You may think you know the story of the moon landings, but there are many more make-or-break moments that have been overlooked or forgotten.

It's the Cold War's dirty little secret - a terrifying account of the CIA's efforts to master the art of mind control.

In 1971, a hijacker, named Dan Cooper, parachuted from a plane with a request of $200,000, crafting the FBI's only unsolved hijacking case. With help of modern forensics, experts hope DNA analysis will solve the mystery.

Did the military recover dead aliens and their spaceship? If true, the US government has kept one of the greatest secrets in history.

When Russia's last tsar, Nicholas II, and his family disappeared almost 100 years ago, eyewitnesses indicated the family was brutally murdered. Now scientists attempt to identify remains that were discovered near the possible murder site.

How and why did a man so rich, so accomplished and so visible become so reclusive, phobic and fragile? How much truth is there in the popular image of Hughes' descent into madness? What can recent medical discoveries contribute to our understanding of this man, his habits, behaviors and final years? NGC reviews recent studies of America's most bizarre billionaire.

An investigation of the rumors that Hitler escaped from his Berlin bunker at the end of World War II, and the controversy surrounding Hitler's fate immediately after the war.