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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?

For more than a decade, Ancient Aliens has collected dozens of reports of encounters with strange and mysterious beasts. Now, Ancient Astronaut Theorist Giorgio Tsoukalos takes a look back at The Top Ten Extraordinary Creatures we've investigated.

Ancient Aliens is counting down the top ten locations around the world that just might be hiding alien bases, including a cavern beneath the ice of Antarctica.

Ancient Aliens is counting down the top ten scariest encounters that just might be evidence of extraterrestrial visitation. Are these frightening encounters proof of extraterrestrial contact?

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.

More than 7,000 years ago, the ancient Sumerians established what is considered the world's first civilization, 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 epicenter 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.

Considered by many to be the greatest civilization in the history of the Americas, the Maya thrived for more than 2,000 years. Now, new evidence is being discovered that might provide evidence that the Maya came in contact with extraterrestrial visitors.

For thousands of years, cultures around the world have held a belief in stargates through which beings have traveled to Earth from distant points in the universe and even other dimensions. Could such portals truly exist?

For decades, incredible claims have been made about an extraterrestrial presence on Earth--and the government has gone to great lengths to discredit them. Are we nearing the day when whistleblowers will finally be taken seriously?

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. But he is best known for his revolutionary work in the field of UFOs, and his bold theories challenge our notions of alien life.

Throughout ancient cultures there are stories of god-like beings providing instruction to early humans, helping our ancestors to establish the first civilizations and teaching them in various disciplines. Could it be true?

Deep beneath the sands of Egypt lie 24 enormous sarcophagi--and every one of them is empty. What purpose might these giant tombs have served?

For more than four decades, award-winning journalist Linda Moulton Howe has covered the most mysterious phenomena on Earth.

From biblical patriarchs to modern day alien abductees, throughout history, there have been people who claimed to have contact with otherworldly beings.

Puma Punku in Bolivia features some of the largest stone blocks on Earth, each carved with incredible precision. But the blocks lie scattered across the landscape, baffling archaeologists as to what the ancient site might have been.