Story

After years of silence and secrecy, the U.S. government reveals possible evidence of extraterrestrial life, with analysis from scientific and military experts.

The theory that alien technology helped ancient humans build megalithic stone structures.

Structures and artifacts throughout the world point to advanced technology in the distant past; exploring the possibility that alien technology may have helped ancient humans.

Ancient people described monsters and visitors from the sky; these beings might be aliens, or the product of alien experimentation on humans.

Authors, astronomers and theoretical physicists examine the different technologies that would be required to bridge the stars.

English naturalist Charles Darwin developed the theory of evolution despite a variety of obstacles, including illness, despots and lethal seas.

Nate is an artist and world-traveler discovering creators, innovators, and artists from the past and today.

Exploring the Cassini spacecraft and its sibling lander, Huygens and their scientific studies.

Featuring lessons that guide teenagers to learn about ways to help the environment.

The team digs out plans for an Islamic windmill design.

Amelia Earhart disappears without a trace during an around-the-world flight.

Pilot Charles Lindbergh conquers the Atlantic.

Commentary creates in-depth portraits.

The leader of a radical polygamous sect was called to account for allegedly arranging illegal marriages between his followers and underage girls.

Counting down the most hated person in America.

Interviews with journalists, publishers and others tell the story of Larry Flynt, publisher and champion of free speech.

English naturalist Charles Darwin developed the theory of evolution despite a variety of obstacles, including illness, despots and lethal seas.

Rumors of incest and murder tar the reputation of Lucrezia Borgia.

Hunted until he was gunned down by the FBI, gangster John Dillinger was a charismatic and mythical figure.

Amelia Earhart disappears without a trace during an around-the-world flight.

Pilot Charles Lindbergh conquers the Atlantic.

Commentary creates in-depth portraits.

The leader of a radical polygamous sect was called to account for allegedly arranging illegal marriages between his followers and underage girls.

Counting down the most hated person in America.

Interviews with journalists, publishers and others tell the story of Larry Flynt, publisher and champion of free speech.

English naturalist Charles Darwin developed the theory of evolution despite a variety of obstacles, including illness, despots and lethal seas.