Giorgio Tsoukalos

Ever since Plato first wrote about the mysterious island of Atlantis, it has captured the imagination of adventurers and academics alike. Was Atlantis merely a myth, or could it have actually existed in the remote past?

A mysterious rock bearing a cryptic design was discovered in Roswell, New Mexico in 2004. Now coined "The Roswell Rock," this piece of stone is unusually smooth and possesses unique magnetic properties.

Nazca remains one of the most mysterious sites on Earth. The vast desert floor is covered with hundreds of ancient geoglyphs depicting animals, human-like figures and strange geometric designs. But, many of these glyphs are so large.

The mysterious Mediterranean island of Malta lies south of Sicily and is home to megalithic structures built by a mysterious prehistoric society.

The Loch Ness Monster is one of the world's most enduring mysteries. But there have also been accounts of similar cryptids all over the planet.

"From prehistoric stone monoliths and sacred temples to dragon gods and time travelers, this season explores ancient technology and timeless relics that span the globe and the galaxy. As the government shifts from denial of the existence of extraterrestrials presence on Earth to releasing their extensive, formerly secret, reports on unexplained phenomena, there is growing belief that aliens may not be visitors from other planets, but perhaps creatures...

"Celebrating twelve years of extraterrestrial exploration, this season of HISTORYʼs ANCIENT ALIENSʼ takes flight with a special two-hour crossover episode with HISTORYʼs THE UNXPLAINED's host, the ultimate 'final frontiersman' William Shatner. Follow this season's thrilling investigations from the ancient civilization of Peru to the fascinating realms of genetics and harmonic code and join ancient astronaut theorist Giorgio A. Tsoukalos as he reveals...

If ancient aliens visited Earth, can evidence of their existence be found in the mysterious structures that still stand throughout the world?

Might the tools and technology of ancient builders have come from distant galaxies? Evidence suggests that an ancient mountaintop fortress in Peru was constructed with laser-like tools... temples at Vijayanagara India were built to harness cosmic energy.

If ancient aliens visited Earth, were they responsible for catastrophes, wars and other deadly disasters to control the fate of the human race?