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From Truman to Trump, there has been a legacy of secrecy and controversy surrounding UFOs and extraterrestrials. In fact, Eisenhower, Nixon, Carter, and Reagan are each rumored to have had personal encounters. Could these powerful leaders be hiding the truth about UFOs from the public? Or is it possible that some Presidents are kept in the dark?

Experts reveal the mysteries behind the moai statues of Easter Island. Ancient investigations turn tech as specialists harness an advanced digital forensics lab and use the latest scientific discoveries to solve the biggest mysteries of ancient history.

The Gene: An Intimate History is a four-hour documentary from Ken Burns and Barak Goodman, adapted from the award-winning book of the same name by Dr. Siddhartha Mukherjee. The series tells the story of the rapid evolution of genetic science …

The second season begins with Bob Baer and John Cencich has new experts and new technology to research increasingly Hitler's possible escape. They uncover new information which is useful for their investigation.

These are the REAL stories of the medieval Knights who dedicated their entire lives to God and to the fight against His enemies…the men of the Holy Orders …The CRUSADERS.

Throughout American history, from the Revolution to San Juan Hill and to the sands of Iraq, black soldiers have fought and died under the Stars and Stripes. Long before they were recognized as citizens, much less equals, African-Americans sacrificed their lives for a society from which they were largely excluded. Through period accounts, first-person recollections, and rare photos and footage, the difficult journey of the African-American men and women who fought to secure their rightful place in the U.S. Military is followed.

This two-hour special looks back at Dec. 7, 1941 — the date that has indeed lived in infamy, as President Franklin Roosevelt promised — when imperial Japan attacked the U.S. naval forces in Hawaii, ushering America into World War II. The attack killed more than 2,400 people, wounded 1,000 and damaged or destroyed nearly 20 American ships and over 300 airplanes.

The Nazis knew it was their last chance. The British knew it was the deadliest threat they'd ever face. And the Americans knew it could fall into the wrong hands. The V2 rocket quickly became Hitler's greatest deadly weapon and beacon of hope to turn the course of World War II in his favor. Watch Nazi Germany's desperate attempt at victory as the Allies race to stop them and see how the V2 miraculously went from deadly weapon to amazing feat of space technology.

Gunny's back — Marine Corps veteran R. Lee Ermey, acclaimed for his role as a Marine Drill Instructor in the movie Full Metal Jacket, previously hosted the popular "Mail Call" show on the History Channel. He now returns in Lock N' Load, an hour-long weekly series featuring the engineering and development of military weapons. The focus of Lock N' Load is firepower — and lots of it.

The BBC's definitive television history of the rise and fall of the Nazis. The Nazis - A Warning From History exposes the popular myths surrounding the rise and fall of the Third Reich. The series explores how the Nazis came to power, how they ruled, how they treated their occupied territories and, above all, how a cultured nation could be responsible for such acts of inhumanity. How could a political party as fundamentally evil and overtly racist as the Nazis come to power? This remains one of the most enigmatic questions of the last century.