From a cave in Ecuador said to hold metal tablets containing alien knowledge, to an underground city in Turkey, these are the stories of supposed extraterrestrial lairs.

Josh and Old Smokey take a trip to an abandoned mining town to dig for forgotten food. Then they chug one of America's most infamous lost beers. And later, they get an opportunity to taste a Viking elixir.

Josh and Old Smokey eat decades old corn chips and century-old Civil War hardtack, then "freshen up" with 100-year-old tooth powder, all to determine whether these forgotten foods have survived the test of time.

Explore the evolution of animal shape and discover how the slightest alteration can mean the difference between life and extinction.

Inspired by the divine, we create monuments to its power (Stonehenge, the Great Pyramid). New challenges create new sciences, and when the Romans mixed volcanic ash with water they created a new super-material: concrete.

No prizes for second place! In this episode we learn how being the fastest enabled empires to be born and capitalism to thrive.

Relive the epic battle which saw Caesar's Roman forces use audacious tactics to overcome a Gallic army that outnumbered them five to one.

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.

Marty's childhood dreams are realised when he's invited to join the search for a lost treasure off the coast of an abandoned, and dangerous, island in Lake Michigan.

For each person, reality is slightly different, but we agree that the sky is blue, lemons are sour, and horns are loud. But what about when one or more of your senses is heightened or changed? And is it possible that we have a mysterious "6th sense"?

From a cave in Ecuador said to hold metal tablets containing alien knowledge, to an underground city in Turkey, these are the stories of supposed extraterrestrial lairs.

Josh and Old Smokey take a trip to an abandoned mining town to dig for forgotten food. Then they chug one of America's most infamous lost beers. And later, they get an opportunity to taste a Viking elixir.

Josh and Old Smokey eat decades old corn chips and century-old Civil War hardtack, then "freshen up" with 100-year-old tooth powder, all to determine whether these forgotten foods have survived the test of time.

Explore the evolution of animal shape and discover how the slightest alteration can mean the difference between life and extinction.

Inspired by the divine, we create monuments to its power (Stonehenge, the Great Pyramid). New challenges create new sciences, and when the Romans mixed volcanic ash with water they created a new super-material: concrete.

No prizes for second place! In this episode we learn how being the fastest enabled empires to be born and capitalism to thrive.

Relive the epic battle which saw Caesar's Roman forces use audacious tactics to overcome a Gallic army that outnumbered them five to one.

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.

Marty's childhood dreams are realised when he's invited to join the search for a lost treasure off the coast of an abandoned, and dangerous, island in Lake Michigan.

For each person, reality is slightly different, but we agree that the sky is blue, lemons are sour, and horns are loud. But what about when one or more of your senses is heightened or changed? And is it possible that we have a mysterious "6th sense"?

From a cave in Ecuador said to hold metal tablets containing alien knowledge, to an underground city in Turkey, these are the stories of supposed extraterrestrial lairs.

Josh and Old Smokey take a trip to an abandoned mining town to dig for forgotten food. Then they chug one of America's most infamous lost beers. And later, they get an opportunity to taste a Viking elixir.

Josh and Old Smokey eat decades old corn chips and century-old Civil War hardtack, then "freshen up" with 100-year-old tooth powder, all to determine whether these forgotten foods have survived the test of time.

Explore the evolution of animal shape and discover how the slightest alteration can mean the difference between life and extinction.

Inspired by the divine, we create monuments to its power (Stonehenge, the Great Pyramid). New challenges create new sciences, and when the Romans mixed volcanic ash with water they created a new super-material: concrete.

No prizes for second place! In this episode we learn how being the fastest enabled empires to be born and capitalism to thrive.

Relive the first battle in the conquest of the Promised Land, where a defector in Jericho helped the Israelites infiltrate the city, destroying it from the inside.

In 2008, witnesses in Needles, California, saw military helicopters carry away a glowing flying object. What was the government trying to hide? And could UFO clean-ups be common?

Marty's fascination is piqued when a fellow energy entrepreneur shares evidence that suggests his Utah ranch has been the Aztec hiding place of Montezuma's treasure for centuries.

Throughout history, many have believed that certain places, things, or even people can be tainted with dark curses. But can these mysterious curses really have the power to bring us harm? And if so, is it possible to understand their power?

Biblical texts describe winged creatures carrying messages from the heavens. But are angels merely the product of the imagination - or do they really exist?

We go beneath the streets of Japan to see the latest technology that saves the city from the many natural disasters ready to strike. Head back in time to World War II to see how Hiroshima's underground offered protection from the most powerful bombs.

A new breed of tools allows man to face deadly forces once thought impossible. On this episode: a polar survival suit, a thermal imaging fire fighter mask, and a big wave surfing emergency vest.

The Egyptians left a remarkable legacy, and their monuments and great works of art still astound us today. In this episode, we reveal another surprising aspect of Egyptian life - their weapons of war, and their great might on the battlefield.

Relive the first battle in the conquest of the Promised Land, where a defector in Jericho helped the Israelites infiltrate the city, destroying it from the inside.

In 2008, witnesses in Needles, California, saw military helicopters carry away a glowing flying object. What was the government trying to hide? And could UFO clean-ups be common?

Marty's fascination is piqued when a fellow energy entrepreneur shares evidence that suggests his Utah ranch has been the Aztec hiding place of Montezuma's treasure for centuries.

Throughout history, many have believed that certain places, things, or even people can be tainted with dark curses. But can these mysterious curses really have the power to bring us harm? And if so, is it possible to understand their power?