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Did the dinosaurs fall victim to a cosmic collision, or where they deliberately exterminated? Ancient Aliens: Aliens and Dinosaurs: Watch the Full Episode Now

Are ancient rituals evidence that aliens aren't really different life forms, but instead might be advanced humans traveling... Ancient Aliens: The Time Traveler: Watch the Full Episode Now

Helicopters, solar power and the calculator were just a few of Leonardo da Vinci's concepts that were centuries ahead of... Ancient Aliens: The Da Vinci Conspiracy: Watch the Full Episode Now

Throughout the world, ancient rites and rituals are believed to connect humans to another dimension. But just who--or... Ancient Aliens: Aliens and Mysterious Rituals: Watch the Full Episode Now

Reports of encounters with strange beings and sightings of mysterious objects in the sky have occurred throughout history. A... Ancient Aliens: Closer Encounters: Watch the Full Episode Now

Exploring a potential link between ancient monoliths and extraterrestrials. Ancient Aliens: The Monoliths: Watch the Full Episode Now

Examining a theory that aliens helped guide Viking voyages. Ancient Aliens: The Viking Gods: Watch the Full Episode Now

A young man's spiritual journey. A controversial bestseller. And a scientific theory that threatened to change the world.... Ancient Aliens: The Von Daniken Legacy: Watch the Full Episode Now