This episode attempts to answer why the federal government would want to keep a dead explorer's body buried against the family's wishes.

Travel the US and abroad to hear first-hand accounts from seasoned, decorated police officers who have had unbelievable, but substantiated, UFO encounters.

From the beginning of recorded history there have been stories about beings with superhuman strength, super-sonic speed and supernatural abilities. Is it possible that these stories are based on extra-terrestrial beings that once lived on Earth?

It's early morning in Saqqara and Zahi is getting ready to open two sealed tombs for the first time in thousands of years, but Zoe is late again and his patience is wearing thin.

Some of the strangest and deadliest weapons ever built were the prototypes of the modern gun. Was a simple bamboo tube the world's first hand gun? Plus, hidden in an ancient manuscript lies a secret recipe for ancient tracer fire – but does it work?

Mother Nature unleashes a swarm of tornados on a group of storm chasers. A delivery driver in Japan gets swallowed by the deadliest tsunami in Japan's history. And finally, a massive avalanche barrels into a small town in Norway.

Many years before modern air travel, the ancient Chinese had learned and were practising the complicated principles of fluid and aerodynamics in the kites they flew, the boats they sailed and the children’s toys they made.

Lenny and Gerrard make a startling discovery in a sabotaged aircraft hangar in northern Germany. Mike and James scan an Austrian lake in search for a large cache of secret Nazi documents.

This episode attempts to answer why the federal government would want to keep a dead explorer's body buried against the family's wishes.

From the beginning of recorded history there have been stories about beings with superhuman strength, super-sonic speed and supernatural abilities. Is it possible that these stories are based on extra-terrestrial beings that once lived on Earth?

It's early morning in Saqqara and Zahi is getting ready to open two sealed tombs for the first time in thousands of years, but Zoe is late again and his patience is wearing thin.

Some of the strangest and deadliest weapons ever built were the prototypes of the modern gun. Was a simple bamboo tube the world's first hand gun? Plus, hidden in an ancient manuscript lies a secret recipe for ancient tracer fire – but does it work?

Mother Nature unleashes a swarm of tornados on a group of storm chasers. A delivery driver in Japan gets swallowed by the deadliest tsunami in Japan's history. And finally, a massive avalanche barrels into a small town in Norway.

Many years before modern air travel, the ancient Chinese had learned and were practising the complicated principles of fluid and aerodynamics in the kites they flew, the boats they sailed and the children’s toys they made.

Lenny and Gerrard make a startling discovery in a sabotaged aircraft hangar in northern Germany. Mike and James scan an Austrian lake in search for a large cache of secret Nazi documents.

This episode attempts to answer why the federal government would want to keep a dead explorer's body buried against the family's wishes.

Travel the US and abroad to hear first-hand accounts from seasoned, decorated police officers who have had unbelievable, but substantiated, UFO encounters.

From the beginning of recorded history there have been stories about beings with superhuman strength, super-sonic speed and supernatural abilities. Is it possible that these stories are based on extra-terrestrial beings that once lived on Earth?

It's early morning in Saqqara and Zahi is getting ready to open two sealed tombs for the first time in thousands of years, but Zoe is late again and his patience is wearing thin.

Some of the strangest and deadliest weapons ever built were the prototypes of the modern gun. Was a simple bamboo tube the world's first hand gun? Plus, hidden in an ancient manuscript lies a secret recipe for ancient tracer fire – but does it work?

Mother Nature unleashes a swarm of tornados on a group of storm chasers. A delivery driver in Japan gets swallowed by the deadliest tsunami in Japan's history. And finally, a massive avalanche barrels into a small town in Norway.

The Universe

Is Planet Earth a commonly occurring planet or a one in a billion freak? Scientists reveal their hunt for planets outside of our solar system and the search for alien life.

In Norway, Tim and Gerrard explore a hydroelectric plant where the Nazis were close to producing a nuclear weapon. Mike and James investigate a cabin in the Alps where Hitler's top associate made the ultimate sacrifice.

The team discover that America's most powerful icon of freedom - the Statue of Liberty - might actually be covered with secret symbols put there by a sinister group bent on world domination.

In 1990, a pilot flying his small plane off Catalina Island spotted an object just below the surface of the water which enveloped his plane with a bright light, freezing his controls.

One of the most prolific inventors of the 20th century, Nikola Tesla shepherded mankind to a new industrial era and laid the groundwork for today's technological age. Is it possible that he was influenced by some otherworldly design?

A look at the demise of the Roman Empire. Despite efforts from the last Emperor, the Romans become outnumbered by foreign invaders.

Plants are used for food, medicine and clothing, to build our world and change how we feel - and they have played a vital role in our evolution.

Tools and machines have allowed us to overcome our physical limitations, but they are also transforming what it means to be human.

Join Bobby Bognar on a journey from hot dog shapes to beer spices and more!