Investigating whether South American piranhas appearing in US lakes and rivers are adapting, can breed and cause devastation.

Coded Templar symbols lead the team to a mysterious monastery in Spain that may hold clues to the knights' ultimate survival as a secret organisation.

Ever since Roswell, observers have noted that UFOs allegedly appear in locations that are already full of secrets and mystery: namely, weapons labs. The question is, why?

The team embark on a quest to find astounding analogies that demonstrate the mind-boggling size of the universe.

James Nesbitt explores some of Britain's most tragic disasters, starting with the 1999 rail accident at Ladbroke Grove in London.

Mother Nature wreaks havoc as a volcano erupts in the Pacific northwest, a tornado chases a family and a dust storm suffocates cities around the globe. (9 of 10)

Documentary exploring how ancient civilisations created weapons of mass destruction that are even more deadly than those created today.

Crop circles are a global phenomenon, with 10,000 seen worldwide. But are these strange patterns simply a hoax or could they be proof of UFO activity?

Investigating whether South American piranhas appearing in US lakes and rivers are adapting, can breed and cause devastation.

Coded Templar symbols lead the team to a mysterious monastery in Spain that may hold clues to the knights' ultimate survival as a secret organisation.

Ever since Roswell, observers have noted that UFOs allegedly appear in locations that are already full of secrets and mystery: namely, weapons labs. The question is, why?

The team embark on a quest to find astounding analogies that demonstrate the mind-boggling size of the universe.

James Nesbitt explores some of Britain's most tragic disasters, starting with the 1999 rail accident at Ladbroke Grove in London.

Mother Nature wreaks havoc as a volcano erupts in the Pacific northwest, a tornado chases a family and a dust storm suffocates cities around the globe. (9 of 10)

Documentary exploring how ancient civilisations created weapons of mass destruction that are even more deadly than those created today.

Crop circles are a global phenomenon, with 10,000 seen worldwide. But are these strange patterns simply a hoax or could they be proof of UFO activity?

Investigating whether South American piranhas appearing in US lakes and rivers are adapting, can breed and cause devastation.

Coded Templar symbols lead the team to a mysterious monastery in Spain that may hold clues to the knights' ultimate survival as a secret organisation.

Ever since Roswell, observers have noted that UFOs allegedly appear in locations that are already full of secrets and mystery: namely, weapons labs. The question is, why?

The team embark on a quest to find astounding analogies that demonstrate the mind-boggling size of the universe.

James Nesbitt explores some of Britain's most tragic disasters, starting with the 1999 rail accident at Ladbroke Grove in London.

Mother Nature wreaks havoc as a volcano erupts in the Pacific northwest, a tornado chases a family and a dust storm suffocates cities around the globe. (9 of 10)

Documentary exploring how ancient civilisations created weapons of mass destruction that are even more deadly than those created today.

Might the United States military really have a secret space programme? And if so, are we preparing for a space-based war with other nations... or other species?

Investigating tales of a humanlike beast with reptilian skin, that has reportedly been terrorising Flatwoods, West Virginia using a strange flying craft.

Seven years after the alleged end of the Templars, signs the knights were rising again appear in Portugal.

What would happen if a UFO actually did land on Earth and humans found it? Engineers create a "spaceship" to see how alien technology could work.

Some of the world's leading scientists look beyond the borders of our solar system to explain what's nearby in our galaxy, the Milky Way.

Cutting-edge technology gives an insider's look at the subterranean city built within Churchill's secret bunkers during the Second World War.

The Annihilator: Relive Hannibal's three dramatic victories in an exploration of his epic career and hatred of Rome.

Could the Bible contain contradictions, or hidden meanings, that challenge our beliefs about what is right and wrong regarding human sexuality?

Might the United States military really have a secret space programme? And if so, are we preparing for a space-based war with other nations... or other species?

Investigating tales of a humanlike beast with reptilian skin, that has reportedly been terrorising Flatwoods, West Virginia using a strange flying craft.