The History Channel

For thousands of years, pyramids were the largest structures on Earth. The best known were constructed in Egypt and Central America, but others have been found all around the world, including in China, Africa and Indonesia. But what purpose did the pyramids serve? Researchers explore strange similarities between all pyramids, as well as the geographic, strategic and otherworldly connections between these mysterious monumental structures.

In the late 1500s, years before Jamestown, the English sought to create their first settlement in America at Roanoke. A party of 119 colonists came over and settled but ultimately vanished. The fate of the Lost Colony of Roanoke has eluded archaeologists, historians and North Carolina locals, but as forensic geologist Scott Wolter discovers, a series of 48 stone clues that have been largely ignored and considered frauds may in fact hold the answer to America's oldest cold case.

In 1998, a team of paleontologists working on the island of Madagascar uncover the remains of Majungatholus--one of the most terrifying predators of its age. However, several bones are found to hold bite marks from another predator. Modern crime scene investigative methods are used to measure the bite marks, and together with evidence found at another site, the attacker is identified as another Majungatholus; thus uncovering the first authentic case of dinosaur cannibalism. Experts recreate a scenario of what occurred when a male Majungatholus went in search of a mate, but found a non-receptive female who was more interested in protecting her young than mating.

In south central Montana, a group of bird-like predators called Deinonychus are unearthed, altering our view of dinosaurs forever. Scientists are quick to recognize that these creatures, equipped with a deeply recurved sickle-shaped claw, do not fit into the image of a slow-moving, cold-blooded dinosaur. Lying next to the skeletons of these raptors were the remains of a large plant-eating dinosaur called Tenontosaurus. Modern CAT Scanners help scientists get a never-before-seen look into how these animals moved, fought and behaved. Watch as experts recreate what happened when a pack of deadly raptors took on an adversary more than twice their own size.

Hundreds of ghost stories lurk in the shadows of London, England, but behind every myth and legend is the terrifying truth that sheds light on one of the darkest periods of this city's history. In Victorian times, violent crimes, extreme poverty and lawlessness forced Londoners to band together to survive. In a time when science and medicine challenged the Church, and disease and overpopulation drove the poor to do jobs only the Devil himself could imagine, London set the stage for chaos. From body snatchers and serial killers to occult clubs and pagan rituals, Victorian Londoners lived by their own rules...both above and below ground. Don Wildman explores London from the bottom up and tells the stories most would rather remain buried.

The ancient world was shaped by people who believed they foresaw the will of God. Jerusalem is at the heart of all their fiery prophecies. From the outcome of bloody wars to the birth of saviors, Jerusalem has been at the center of prophetic revelations. Join host Don Wildman as he peels back the layers of this sacred subterranean landscape to uncover an ancient escape route, a secret bullet factory, and the birthplace of Jesus. He sets out to find the truth behind Jerusalem's most mysterious and enduring prophecies, the people who foretold them and what was left behind... underground.

The single longest linear feature on Earth--the "Ring of Fire" circles almost the entire Pacific. It is a ring of active volcanoes from White Island just north of New Zealand, through the South China seas, Japan, Kamchatka, the Aleutians, the Cascades and down through the Andes. Almost 25,000 miles long, it is one of the most awesome sights on Earth.

The Marianas Trench is the deepest place on earth, deeper than Mt. Everest is high. The trench is where the ocean floor disappears into the center of the earth. The pressures at this depth are 17 times greater than what it takes to crush a nuclear submarine. Only two men have ever been down the Trench, fewer than have set foot on the moon. Follow the daring missions into the abyss and explore the extraordinary geology that has created this deep scar along the ocean floor.

Over 20 years ago, Mt. St Helens--thought to be dormant--shocked America when it exploded. It is an acidic volcano--the magma beneath is full of volatiles making it highly explosive. A new plug has formed in its throat and is rising. When it blows it will be like uncorking a champagne bottle, releasing pressure below and allowing dissolved gases to escape and explode. The question is...when will it blow again?

Marvels of the modern age, today's aircraft are awe inspiring. However, once their flying days are over, the boneyard beckons. Dismantling large aircraft is complex and challenging. Some planes will be destroyed while others are restored to their former glory. No matter which fate awaits, the process always takes place in the boneyard.

Informational programming.

Informational programming.

Informational programming.

Informational programming.

Criminals end up in human boneyards called prisons, but the weapons and tools of the crimes end up in an assortment of other boneyards. These include everything from secure warehouses to underwater tourist attractions to "virtual boneyard" computer databases. Discover the unusual fate that awaits these items; some will become tools to fight crime, some destroyed and others will be transformed to create good from the ruins of evil.

In 1998, a team of paleontologists working on the island of Madagascar uncover the remains of Majungatholus--one of the most terrifying predators of its age. However, several bones are found to hold bite marks from another predator. Modern crime scene investigative methods are used to measure the bite marks, and together with evidence found at another site, the attacker is identified as another Majungatholus; thus uncovering the first authentic case of dinosaur cannibalism. Experts recreate a scenario of what occurred when a male Majungatholus went in search of a mate, but found a non-receptive female who was more interested in protecting her young than mating.

In south central Montana, a group of bird-like predators called Deinonychus are unearthed, altering our view of dinosaurs forever. Scientists are quick to recognize that these creatures, equipped with a deeply recurved sickle-shaped claw, do not fit into the image of a slow-moving, cold-blooded dinosaur. Lying next to the skeletons of these raptors were the remains of a large plant-eating dinosaur called Tenontosaurus. Modern CAT Scanners help scientists get a never-before-seen look into how these animals moved, fought and behaved. Watch as experts recreate what happened when a pack of deadly raptors took on an adversary more than twice their own size.

Hundreds of ghost stories lurk in the shadows of London, England, but behind every myth and legend is the terrifying truth that sheds light on one of the darkest periods of this city's history. In Victorian times, violent crimes, extreme poverty and lawlessness forced Londoners to band together to survive. In a time when science and medicine challenged the Church, and disease and overpopulation drove the poor to do jobs only the Devil himself could imagine, London set the stage for chaos. From body snatchers and serial killers to occult clubs and pagan rituals, Victorian Londoners lived by their own rules...both above and below ground. Don Wildman explores London from the bottom up and tells the stories most would rather remain buried.

The ancient world was shaped by people who believed they foresaw the will of God. Jerusalem is at the heart of all their fiery prophecies. From the outcome of bloody wars to the birth of saviors, Jerusalem has been at the center of prophetic revelations. Join host Don Wildman as he peels back the layers of this sacred subterranean landscape to uncover an ancient escape route, a secret bullet factory, and the birthplace of Jesus. He sets out to find the truth behind Jerusalem's most mysterious and enduring prophecies, the people who foretold them and what was left behind... underground.