History's Secrets

Police closed the case of the infamous Boston Strangler when Albert De Salvo confessed to the grisly murder of 13 women. But recent forensic evidence reveals the Strangler could still be at large.

In 1918 Russia's last imperial dynasty, the Romanovs, were assassinated. But doubts remain as to whether all members of the royal family were put to death. Did the Tsar's daughter, Anastasia, escape?

On July 8, 1947, the U.S. Army issued a press statement claiming to have recovered a flying saucer on a ranch outside Roswell, New Mexico. But within hours they retracted the statement saying they had only found the remains of a weather balloon. Sixty years later the debate still rages and Roswell has become the UFO capital of the world. Did the military really recover dead aliens and their spaceship, as some people claim?

For 20 years, FBI Director J. Edgar Hoover denied the existence of the mafia. Was it because he was being blackmailed by them, with the threat of being exposed as a gambler and cross-dresser?

As world famous aviator Amelia Earhart closed in on her record-setting attempt to fly around the world in July 1937, she disappeared somewhere over the Pacific Ocean - vanishing without a trace. Did she run out of fuel and crash into the sea? Or could she have survived? NGC explores one of the most fiercely debated mysteries of all time. Investigators build the case that she was a pawn in an espionage plot for President Franklin D. Roosevelt, while eyewitnesses testify she was captured by the Japanese military. Examine the evidence and decide for yourself what might have happened to Amelia Earhart.

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.

Ted Kaczynski sent the FBI on a $50 million manhunt. We investigate how his childhood as a prodigy led him to academic glory at Harvard.

Neil Armstrong, the 1st human being to set foot on another planet. We bring you the the untold stories of Apollo 11's mission and the 5 moon landings.

A US army scientist died for his involvement in a secret CIA experiment.What was the true extent of these secret CIA experiments and their casualties?

NGC delves into the tumultuous history of the atom bomb - filled with deception, twists and danger that even Hollywood couldn't make up. Culling from rarely seen archival footage and interviews with leading experts, we'll see how Soviet spies gathered top-secret information during WWII. Learn why China shared its nuclear weapons technology with other countries. Find out how Israel's nuclear weapons program was exposed by a disgruntled worker who leaked information before being kidnapped.