Ancient Aliens

Did a biblical patriarch receive instructions from 200 angels high above the earth? Were the ancient Greeks taught how to work metal by a race of fish-people? And might Egypt's most controversial Pharoah have been an extraterrestrial being?

Giorgio Tsoukalos takes a look back at the top 10 reports of encounters with strange and mysterious beasts that have been investigated.

Counting down the top 10 locations around the world that may be hiding alien bases, including a cavern beneath the ice of Antarctica, a lake in China that is a hotspot for UFOs, and a pyramid under the slopes of Mount Denali.

Ancient Aliens is counting down the top ten scariest encounters that just might be evidence of extraterrestrial visitation.

Ancient Aliens is counting down ten of the most intriguing, and mysterious, symbols and codes found across the globe that just might contain proof of otherworldly contact.

Ancient Aliens is counting down the top ten most devastating disasters ever documented that might have an otherworldly connection, from a flying monster at a nuclear incident, a meteor that wiped out the dinosaurs, and a deadly virus.

More than 7,000 years ago, the ancient Sumerians established what is considered the world's first civilisation, and they credited their extraordinary achievements to their gods, the Anunnaki.

Along the Earth's north 37th parallel there have been so many reports of unidentified flying objects, animal mutilations, and other mysterious events that it has been dubbed The UFO Superhighway.

For thousands of years, Scotland has been an epicentre of otherworldly phenomena. It is home to mysterious ancient stone circles, stories of strange beings, and is a major hotspot for UFO sightings.

Throughout the world there are mysterious ancient stones shaped into perfect spheres. Many of them show clear evidence of being manmade and some completely defy explanation. Could the mystery of the stone spheres provide clues about humankind's past?

The Mayan culture thrived in the ancient Americas for more than 2,000 years, but evidence suggests they may have had contact with extraterrestrial visitors, and challenges historians' understanding of their culture.

Throughout human history, cultures around the world have held a belief in star gates, through which beings travel to Earth from distant points in the universe and even from other dimensions.

Examines whistle-blower accounts about extraterrestrial presence on Earth, crashed UFOs, recovered alien entities, and claims about how the government goes to great lengths to discredit them.

Now, in the 21st century, the search for extraterrestrial intelligence is ramping up like never before, with powerful new technologies allowing us to explore billions of stars across the universe. Are we on the verge of first contact?

Dr. Jacques Vallee holds multiple scientific degrees, is a best-selling author, and is one of the fathers of the internet.