Ancient Aliens

Studies have shown that up to 70% of all UFO sightings happen in so-called `hotspots' where reports of visions, mysterious lights and unusual phenomena are regularly witnessed.

More than 10,000 crop circle formations have been documented in over 50 countries, and many display properties that defy conventional explanations. Are they of otherworldly origin? And if so, what is their purpose?

Could recent discoveries provide evidence of a civilization that existed far earlier than we ever imagined? Perhaps even before the biblical story of the Great Flood--at a time when humans shared the earth with otherworldly beings?

While mainstream scholars identify the towering obelisks of ancient Egypt as monuments to the pharaohs, others suggest they may have served a technological purpose.

The Mutual UFO Network--better known as MUFON--is the world's leading organization devoted to the scientific investigation of unidentified aerial phenomena and other unexplained encounters.

Meteor impacts have significantly altered our world, creating the perfect environment for the rise of humankind. But could new evidence reveal that celestial objects have been directed to Earth by an alien intelligence?

The Center for the Study of Extra-Terrestrial Intelligence defines a "Close Encounter of The Fifth Kind" as direct human contact and communication with extraterrestrial life.

The vast Alaskan wilderness is well known for mysterious disappearances, electromagnetic anomalies, stories of strange creatures, and is a hotspot for UFO sightings.

The vast Alaskan wilderness is well-known for mysterious disappearances, electromagnetic anomalies, stories of strange creatures and is a hotspot for UFO sightings.

Terrifying encounters at 40,000 feet. Pilot accounts of UFOs taking control of their aircraft. Entire jumbo jets disappearing into thin air. Since the dawn of aviation, pilots have experienced unexplainable events in the sky.

Since the dawn of aviation, pilots have experienced unexplainable and sometimes terrifying events in the sky.

Could the ancient mysteries that exist on the Mediterranean islands of Malta be connected to local legends of alien visitation--and giant hybrid beings?

Could the ancient mysteries that exist on the Mediterranean islands of Malta be connected to local legends of alien visitation-and giant hybrid beings?

We're counting down the world's top ten pyramid sites. Could the extraordinary structures that stand at these sites provide evidence of extraterrestrial visitation?

Ancient Aliens is counting down the world's top ten pyramid sites. Could the extraordinary structures that stand at these sites provide evidence of extraterrestrial visitation?

Ancient Aliens is counting down the world's top ten mysterious devices, from strange, grooved disks found in a cave in China to an ancient Greek computer to an incredible crystal skull unearthed in Mexico.

Ancient Aliens is counting down the world's top ten mysterious islands, including sites said to be home to giants, remote landmasses that are home to massive megalithic structures, and even islands that disappear into thin air.

Around the world and throughout history, people have reported seeing very similar types of unidentified objects in the sky. Now, Ancient Aliens is counting down the top ten alien craft.

In the early 1900s, a modern-day prophet from Kentucky became a worldwide sensation. He claimed to receive visions and have encounters with otherworldly beings. Could it be that Edgar Cayce was a vessel used to carry out an alien agenda?

More than 3,000 years ago, the ancient Greeks built an empire that is considered the birthplace of Western Civilization. But is it possible that these powerful beings from Mt. Olympus were, in fact, extraterrestrial visitors to Earth?

In the 21st century, UFOs have gone from fringe science to mainstream obsession. A new generation of UFO hunters is employing incredible technology, and Unidentified Flying Objects are being openly investigated by the government.

For thousands of years, people have held the belief that everyday objects can possess hidden energy. Talismans are seen as providing protection, good fortune, and some are even thought to embody a higher power.

We're counting down the top ten mysteries of the deep, from sunken continents to puzzling ruins on the ocean floor and even artifacts that might be remnants of Atlantis.

Ancient Aliens is counting down the top ten alien petroglyphs around the world, from strange, human-like figures to flying craft and carvings of what appear to be astronauts.