History HD reveals the power and passion of history as an inviting place where people experience history personally and connect their own lives to the great lives and events of the past.

History HD

History - fascinating and exclusive programs on subjects ranging from American and world history to explorations of major events in politics, entertainment and social history.

History

Counting down ten of compelling - and covert - projects that study the UFO phenomenon; from clandestine government organizations to agents that silence UFO witnesses and secret programs to reverse engineer alien technology.

Ancient Aliens

The Top Ten Secret Projects

Mysterious golden orbs discovered in Mexico; a sacred wooden box that could communicate with the heavens; an ancient tomb that is said to depict an astronaut; might these artifacts be evidence of otherworldly contact?

The Top Ten Unexplained Technologies

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HISTORYCHANNEL

"Ancient Aliens" is counting down ten compelling UFO crashes that have been reported across the globe; from an acorn-shaped object that crashed in the woods of rural Pennsylvania, to a mysterious craft that washed ashore in Japan.

The Top Ten UFO Crashes

Counting down ten mysterious monoliths; from a 500-ton stone believed to represent an ancient UFO, to giant statues said to have been created with advanced technology, and ornate pillars that depict otherworldly visitors.

The Top Ten Mysterious Monoliths

Counting down 10 discoveries that challenge traditional beliefs about human history, from a lost city hidden in the Andes to mysterious metal spheres that are not of this world and a sunken city that is said to be the home of the gods.

The Top Ten Extraordinary Discoveries

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Texts, archaeology and legend contain evidence of past human-extraterrestrial contact.

S21 E4 | The Top Ten Unexplained Technologies