What if life on Earth began in outer space? Millions of people accept the theory that intelligent life forms visited Earth thousands of years ago and were worshipped as gods by primitive man. Are monuments like Stonehenge and Easter Island the last remains of an ancient alien visitation? From unexplainable super structures, to knowledge of the solar system, mathematics, and even the ability to make electricity, this special explores evidence of super-human influences on ancient man and embarks on an around-the-world search for answers. It's an investigation into a theory some believe cannot be true, but many agree cannot be ignored

Tales of angels and giants in the ancient world are examined to determine if the beings stem from mythology or extraterrestrial visits and experimentation on human DNA, and bizarre discoveries around the world may be the key to getting the answers

Series host and Ancient Astronaut theorist, Giorgio Tsoukalos, explores the mystery of the Nazca Lines found in the desert region of Southern Peru. Hundreds of gigantic lines, some in the shape of animals, geometric patterns and even an alien-like being, extend for miles over a vast section of the arid plain. Scholars are divided as to who built them, and why

Ancient Astronaut theorist, Giorgio Tsoukalos, shares his insight on massive stone structures and strange, giant figures known as Monoliths. What compelled ancient man to move colossal stones, in some cases weighing thousands of pounds, and to build remarkably similar stone monuments all around the world? From the jungles of Costa Rica to England's rural countryside, ancient people achieved extraordinary feats of construction without advanced tools or technology. Is it possible that extraterrestrials instructed the ancients to build these complex structures? Or were our ancestors driven to create these monoliths in order to reconnect with celestial travelers who once walked the Earth? Could ancient monoliths hold advanced, extraterrestrial powers we have yet to realize? And if so, just what will happen when we unlock the mystery of the monoliths?

Giorgio Tsoukalos presents the fascinating story of Nikola Tesla, one of the most prolific inventors of the 20th century--and the man that actually electrified the world. Tesla is credited with shepherding mankind to a new industrial era and laying the groundwork for today's technological age. The genius inventor claimed he could visualize his inventions in full-detail and manipulate them in his mind

Did our ancestors have an understanding of how to generate power thousands of years before modern man? Ancient Astronaut theorist, Giorgio Tsoukalos, theorizes that some of the most famous ruins on Earth may be long-forgotten power sources that hold a celestial connection. From the discovery of an ancient battery in Iraq and the depiction of a primitive light bulb in Egypt, to a wireless power grid that may have reached around the world, there is evidence suggesting ancient man had access to electricity, which, until recently, was believed to be a modern day phenomenon. But if our ancestors did possess power, where did they gain this knowledge? Is it possible that they received this wisdom from an extraterrestrial source as ancient astronaut theorists contend? And, if so, why did the power stop flowing?

Ancient Astronaut theorist, Giorgio Tsoukalos explores one of the most compelling and mysterious locations on Earth, Puma Punku. Forty miles west of La Paz, Bolivia--high in the Andes Mountains--lie the mysterious ancient ruins of Puma Punku. Spread across a desert plateau at an altitude over 12,000 feet, the megalithic stones found scattered here are among the largest on the planet

Giorgio Tsoukalos decodes some of the most compelling evidence for Ancient Astronaut theory found in mysterious carvings, symbols, and structures that are strikingly similar on opposite ends of the Earth. Egyptian pyramids aligned with the stars of Orion's belt match up perfectly with pyramidal structures in Central Mexico. A sacred symbol common to India appears carved into the desert floor of Peru

Ancient Astronaut theorist, Giorgio Tsoukalos, explores the construction, history and technological abilities of the Ark of the Covenant--one of the most sought after religious relics of all times and far more than just a box that contained the Ten Commandments. The biblical stories surrounding the Ark speak of a device with divine powers that was able to produce food, take down stonewalls, kill those that come in contact with it, and provide direct communication to God. Are these stories mere myth? Or did the Ark of the Covenant possess extraordinary powers? Just what was this incredible device? Were its powers the result of divine miracles? Or were they the product of advanced, extraterrestrial technology?

Why are humans so different from every other species on Earth? Did we evolve from apes--or is our intelligence the result of contact with an otherworldly source? Ancient Astronaut theorist, Giorgio Tsoukalos, presents the latest scientific and archeological information on who we are and where we may have come from. Charles Darwin's theory of Natural Selection theorizes that man evolved from apes over millions of years. But new evidence suggests that 50,000 years ago humans experienced enormous changes some call the "Big Bang" of the brain