In a special season finale, Brad Meltzer provides updates on how viewer tips are helping the search for lost and stolen historic artefacts.

A secret serviceman for President Kennedy sheds light on a plot to assassinate JFK on the streets of Chicago, and a treasure hunter may have located Arizona's infamous Lost Dutchman Mine. Plus, could New England be a new Bigfoot hotspot?

HG Wells' classic tale of a Martian invasion has terrified audiences for more than 100 years. The history of its many retellings is revealed.

As science turns towards augmenting humanity with technology, theorists suggest that we are merely following the path of our alien creators.

New technologies have suddenly revealed thousands of distant planets, opening up the most exciting period in astronomy in decades. Some believe we're on the verge of answering the ancient question: are we alone in the universe?

Unusually, we look at the later, clipped wing version flown by Czech refugee pilots in the UK during WW2. We get close-up with a beautifully restored example, fly her and unearth long unseen test and operational footage.

What does the Universe sound like? From the sweep of a pulsar, to the deafening roar of our boiling sun, this episode explores the undiscovered soundscapes of the solar system, the galaxy, and the entire cosmos.

Soaring across some of the widest rivers and deepest valleys on the planet, bridges have always been at the cutting edge of engineering.

In a special season finale, Brad Meltzer provides updates on how viewer tips are helping the search for lost and stolen historic artefacts.

A secret serviceman for President Kennedy sheds light on a plot to assassinate JFK on the streets of Chicago, and a treasure hunter may have located Arizona's infamous Lost Dutchman Mine. Plus, could New England be a new Bigfoot hotspot?

HG Wells' classic tale of a Martian invasion has terrified audiences for more than 100 years. The history of its many retellings is revealed.

As science turns towards augmenting humanity with technology, theorists suggest that we are merely following the path of our alien creators.

New technologies have suddenly revealed thousands of distant planets, opening up the most exciting period in astronomy in decades. Some believe we're on the verge of answering the ancient question: are we alone in the universe?

Unusually, we look at the later, clipped wing version flown by Czech refugee pilots in the UK during WW2. We get close-up with a beautifully restored example, fly her and unearth long unseen test and operational footage.

What does the Universe sound like? From the sweep of a pulsar, to the deafening roar of our boiling sun, this episode explores the undiscovered soundscapes of the solar system, the galaxy, and the entire cosmos.

Dive into the past to find out how the largest mass scuttling of ships in history was linked with medical research and the space programme. We ask why the US government spent millions on a fleet of war ships in WWI, then deliberately destroyed them.

The team gets to the bottom of a mystery concerning the cornerstones of US democracy. Laid by the ultra-secretive Freemasons, a landmark piece of stone vanished. Is there a secret conspiracy tied to the White House itself?

Who is really in control? We ride along with a member of a breakaway order of Catholic exorcists, and seek out the origins of hacker group 'Anonymous'. Plus, is the US government creating mind-controlled super-soldiers like Jason Bourne?

In 1977, a remote Brazilian island was visited nightly by strange flying objects, leaving people with bizarre puncture marks and blood loss. What happened?

Ancient astronaut theorists look at the Aborigine mythos of Dreamtime, and ask if these stories hold the proof that aliens created life on Earth.

Greed, genocide and murder - the likes of Julius Caesar, Genghis Khan, Attila the Hun and Cleopatra stopped at nothing to make sure their names went down in history. Which of these tyrants will be named the number one dictator of the ancient world?

Investigate the ways in which ancient intelligence services passed messages over thousands of miles.

There really are ice worlds like Hoth from Star Wars. In this episode, we explore icy planets and moons, discover the role of cold in the Universe, and learn about the importance of ice to the development of habitable worlds.

Dive into the past to find out how the largest mass scuttling of ships in history was linked with medical research and the space programme. We ask why the US government spent millions on a fleet of war ships in WWI, then deliberately destroyed them.

The team gets to the bottom of a mystery concerning the cornerstones of US democracy. Laid by the ultra-secretive Freemasons, a landmark piece of stone vanished. Is there a secret conspiracy tied to the White House itself?

Who is really in control? We ride along with a member of a breakaway order of Catholic exorcists, and seek out the origins of hacker group 'Anonymous'. Plus, is the US government creating mind-controlled super-soldiers like Jason Bourne?

In 1977, a remote Brazilian island was visited nightly by strange flying objects, leaving people with bizarre puncture marks and blood loss. What happened?

Ancient astronaut theorists look at the Aborigine mythos of Dreamtime, and ask if these stories hold the proof that aliens created life on Earth.

Greed, genocide and murder - the likes of Julius Caesar, Genghis Khan, Attila the Hun and Cleopatra stopped at nothing to make sure their names went down in history. Which of these tyrants will be named the number one dictator of the ancient world?

Investigate the ways in which ancient intelligence services passed messages over thousands of miles.

There really are ice worlds like Hoth from Star Wars. In this episode, we explore icy planets and moons, discover the role of cold in the Universe, and learn about the importance of ice to the development of habitable worlds.

Dive into the past to find out how the largest mass scuttling of ships in history was linked with medical research and the space programme. We ask why the US government spent millions on a fleet of war ships in WWI, then deliberately destroyed them.