Something strange is killing animals and sucking the blood from its victims. Is this creature the mysterious Chupacabra of legend, or a gruesome new hybrid mutation?

The Great Pyramids of Giza have eluded astronomers and archeologists for centuries. The world's renowned Egyptologists, astronomers and engineers join forces to solve some of the long-held mysteries about the pyramids.

Ancient Aliens

The gods worshipped by the Norse Vikings were fearsome and mysterious. Experts investigate whether these powerful Viking Gods could have been visitors from another planet.

The great empires of the ancient world were created through war, and the most defining battles were fought through siege warfare. From the legendary battle of Troy to the fall of Rome, which siege will top our list for being the most devastating?

In the shadow of history, a daring archaeologist unearths Templar secrets. The quest for lost pirate treasure ignites, leading to a mysterious flaming cross.

Religion, mythology, art, power and science all influenced the Seven Wonders of the World. Their engineering still astounds us today.

US airline pilots are reporting near mid-air collisions with UFOs. Elizondo hears a never-before-told account from a major legacy airline pilot whose report of a glowing orange sphere while in the cockpit over Arizona is backed up by photo evidence.

Something strange is killing animals and sucking the blood from its victims. Is this creature the mysterious Chupacabra of legend, or a gruesome new hybrid mutation?

The Great Pyramids of Giza have eluded astronomers and archeologists for centuries. The world's renowned Egyptologists, astronomers and engineers join forces to solve some of the long-held mysteries about the pyramids.

Ancient Aliens

The gods worshipped by the Norse Vikings were fearsome and mysterious. Experts investigate whether these powerful Viking Gods could have been visitors from another planet.

Zahi uncovers a cache of mummies at a dig site at Saqqara and discovers a rare and important piece of Egyptian history: a beautiful anthropoid sarcophagus from the 26th Dynasty!

The great empires of the ancient world were created through war, and the most defining battles were fought through siege warfare. From the legendary battle of Troy to the fall of Rome, which siege will top our list for being the most devastating?

In the shadow of history, a daring archaeologist unearths Templar secrets. The quest for lost pirate treasure ignites, leading to a mysterious flaming cross.

Religion, mythology, art, power and science all influenced the Seven Wonders of the World. Their engineering still astounds us today.

US airline pilots are reporting near mid-air collisions with UFOs. Elizondo hears a never-before-told account from a major legacy airline pilot whose report of a glowing orange sphere while in the cockpit over Arizona is backed up by photo evidence.

Something strange is killing animals and sucking the blood from its victims. Is this creature the mysterious Chupacabra of legend, or a gruesome new hybrid mutation?

The Great Pyramids of Giza have eluded astronomers and archeologists for centuries. The world's renowned Egyptologists, astronomers and engineers join forces to solve some of the long-held mysteries about the pyramids.

Ancient Aliens

The gods worshipped by the Norse Vikings were fearsome and mysterious. Experts investigate whether these powerful Viking Gods could have been visitors from another planet.

Zahi uncovers a cache of mummies at a dig site at Saqqara and discovers a rare and important piece of Egyptian history: a beautiful anthropoid sarcophagus from the 26th Dynasty!

The great empires of the ancient world were created through war, and the most defining battles were fought through siege warfare. From the legendary battle of Troy to the fall of Rome, which siege will top our list for being the most devastating?

In the shadow of history, a daring archaeologist unearths Templar secrets. The quest for lost pirate treasure ignites, leading to a mysterious flaming cross.

The Har at Megiddo gave its name to Armageddon, the final battle described in the book of Revelation. Trace the history of the cities built on this hilltop.

Lue Elizondo previously identified five observable characteristics of UFOs, dubbed the 'five observables'. But there is a so-called sixth observable Elizondo began to investigate - an invisible threat these craft may pose.

They're huge, ferocious and frightening. They live in remote corners of the world. Are these real dragons descendants of prehistoric reptiles?

Sodom and Gomorrah-a Biblical tale of two cities incinerated by a hail of fire and brimstone. Astronomers, archeologists and biblical scholars investigate the possible science behind the myth.

Ancient Aliens

An examination of Erich von Daniken's controversial theories that have captured the attention of the world and ignited a movement known as Ancient Astronaut Theory.

At the end of the 3rd century, one man rose from soldier to Emperor. Heroic Aurelian reunited the empire in just five years and became known as Restorer of the World.

UFO Files

Beginning in the 1960s, thousands of UFO landings, flyovers and collisions have left scientific evidence behind for study. These events have become known in the field of UFOlogy as the "trace cases."