Giorgio Tsoukalos

The imposing city of Washington D.C. was inspired by the ancient world, as seen in the Greek pillars, Roman domes and even an Egyptian-style obelisk that mark the landscape.

At the height of World War II, the Nazis engaged their top scientists to develop "wonder weapons"--weapons that were so scientifically advanced they could have turned the tide of the war against the Allies. According to testimony, one of the top-secret.

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.

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.

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...

Megalithic monuments linked together by electromagnetic energy... Prehistoric ruins arranged across vast distances in straight lines.

Throughout the world, ancient rites and rituals are believed to connect humans to another dimension. But just who--or what--are we communicating with? Could man's attempts to emulate ancient alien visitors?

If extraterrestrials influenced human history, can evidence of their existence be found in hidden tunnels and caverns around the world?

Superhuman strength... Supernatural powers... And the awesome ability to fly. Throughout history, mankind has told incredible tales of gods with extraordinary powers. But are these accounts merely tall tales, or could they be based on factual events?