Across the globe, archaeologists continue to unearth peculiar, elongated skulls. Could our forebears have deliberately altered the form of their own craniums, striving for a resemblance to beings from beyond Earth? Or is there perhaps a cha…

Dominating the landscape high above the Giza Plateau is Egypt's most enigmatic ancient site: the Lost Pyramid of Abu Rawash. Now reduced to ruin, it persists, and certain researchers speculate that its weathered stone blocks may conceal pro…

Across the western Pacific Ocean lies Oceania, an expansive realm encompassing some of the world’s most isolated and enigmatic islands. These lands are distinguished by colossal stone constructions, peculiar statuary depicting unfamiliar fi…

Giorgio Tsoukalos investigates the series' extensive records, examining astonishing ancient constructions that resist easy understanding. From the flawlessly fitted stone at Puma Punku, to the colossal temples of Malta, and the sprawling me…

Stretching from the shores of California to the Hudson Valley in New York, and from Northern England down to Southern Chile, do these enigmatic places offer a glimpse into the possibility of extraterrestrial life visiting our planet?

From a perplexing stone circle in Turkey that seems to defy our understanding of ancient timelines, to colossal stone spheres discovered in Bosnia and the uniquely designed tombs of Egypt, might these remarkable structures offer evidence of…

The oceans are the most mysterious places on Earth. Countless legends tell of powerful beings living in the waters, and today they are major hotspots for UFOs. Is it possible that the deepest depths of our planet—are home to otherworldly be…

Ancient scriptures called the Vedas form the foundation of Hinduism. These manuscripts are thousands of years old and describe a time when Earth was inhabited by gods who traveled the skies in flying machines and possessed extraordinary tec…

Ancient legends describe a war in heaven that was fought by otherworldly beings with extraordinary weapons. Is it possible that our planet still bears the scars of battles fought by extraterrestrials?

Host Giorgio Tsoukalos probes the series archives to present the most compelling UFO SIGHTINGS. From footage of extraordinary aircraft taken by fighter pilots to a strange object filmed flying over a military base in Iraq and mysterious glo…

The rapid development of artificial intelligence has made it a powerful tool for historians and archaeologists. But might it also reveal evidence of an extraterrestrial presence on Earth?

Host Giorgio Tsoukalos examines series archives to investigate theories of historical extraterrestrial contact; the broadcast reviews aerial geoglyphs, crop circles and mathematical codes embedded in ancient global architecture to assess cl…

A documentary examines how researchers utilize remote-sensing technology, such as lidar, to map previously undocumented ancient urban networks beneath the Amazon canopy; the broadcast investigates alternative history theories regarding pote…

Host Giorgio Tsoukalos opens the series archives to celebrate ALIEN INVESTIGATORS that have been brave enough to ask the question, "Are we alone in the universe?" Could these investigators have uncovered proof of an alien presence on earth?