Ancient Aliens

The South American nation of Peru is famous for its Incan ruins and colossal geoglyphs. Could it also be a site of extraterrestrial visitation?

Ancient Aliens is counting down the world's top ten most mysterious sites, from the towering Moai statues of Easter Island to the enormous megalithic blocks of Stonehenge.

We're counting down the world's top ten alien cover-ups, from the famous Roswell Incident to a recently released UFO videos captured by Navy fighter jets.

Mount Shasta in northern California is known as a hotbed of strange events. Could its unique geology and placement on Earth be attracting beings from other worlds?

Scientists know that seven human-like species lived alongside Homo sapiens for thousands of years. Is it possible early humans were the product of extraterrestrial experimentation?

We're counting down the top ten alien encounters, from the first reported abduction event to an incident in ancient Rome that changed the course of human history.

From an ancient figurine of a modern-day airplane to a primitive statue of a man in a spacesuit, we're counting down the top ten alien artifacts.