Ancient Aliens 17, Return To Mars

Following a 2017 public disclosure of secret government UFO investigations, are we any closer to proving there has been a UFO conspiracy?

Researchers claim hidden messages can be found within the works of Leonardo da Vinci that may reveal an extraterrestrial influence.

In 2017, a strange, cigar-shaped object enters the solar system, causing some astronomers to suggest that it could be an extraterrestrial craft.

Theorists speculate about the existence of black holes on Earth, which may explain strange disappearances and other inexplicable phenomena.

Researchers study giant ancient drawings found etched into the desert floor, which may be a part of an ancient alien code.

Could Area 51's notoriety act as a cover up to much bigger, top-secret extraterrestrial experiments taking place at multiple locations?

Oak Island treasure hunter Marty Lagina and Ancient Astronaut theorist Giorgio A. Tsoukalos explore the ancient ruins of Sardinia, Italy.

Seven stone giants stand guard over a Pacific island. But what are they protecting? And from whom?

Have the US and Russia been working together from the beginning of the Space Race in preparation for the ultimate extraterrestrial encounter?

Ancient Astronaut theorists explore the idea that meteorites could be pieces of extraterrestrial technology.

Ancient Astronaut theorist Giorgio A. Tsoukalos explores the latest evidence that suggests extraterrestrials visited Egypt in the distant past.

Are intelligent robots the next step in human evolution? As man and machine begin to merge, are we fulfilling a destiny prepared for us by aliens?

As humanity prepares to establish colonies beyond Earth, are we pursuing a new future for mankind or returning to its extraterrestrial past?

Erich von Daniken's "Chariots of the Gods?" challenged everything we thought we knew about mankind's history, suggesting that aliens visited Earth in the distant past. 50 years after the book's publication, is he about to be proven right?