Ancient Aliens

Could subterranean chambers, ancient ruins and sunken structures be evidence of a lost alien civilization that walked the Earth before recorded history?

Wernher von Braun's pioneering work in rocketry fuels theories that alien tech influenced space travel — and that some secrets remain in orbit today.

From autonomous machines to robot gods, researchers explore whether ancient civilizations created mechanical beings long before modern robotics emerged.

Mythological and occult belief systems describe good and evil beings — and raise the question of whether aliens influenced humanity's heinous acts.

Did multiple alien species shape human development across civilizations? Skeletal anomalies, reptilian deities and bird-headed figures may provide clues.

As astronomers search for habitable exoplanets, theorists examine whether alien civilizations once surveyed Earth — or even colonized it — long ago.

From seafaring myths to plankton discoveries on Earth and in space, researchers consider whether alien life could be hidden in our inhospitable seas.

Researchers examine crop circles worldwide, using lab tests and field recreations to determine if they carry signs of extraterrestrial communication.

After a hacker says he's found a secret US space fleet, theorists explore ideas of ancient extraterrestrial factions and interstellar conflict on Earth.

Political strife and harsh terrain have kept archeological sites sealed for decades. Could these forbidden grounds support theories of alien contact?