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

Carl and Hamilton investigate a Crusader sword and helmet that date back more than 900 years. Then, travelling to Italys 'floating city', they learn more about how and why Venice adopted St Mark as its patron saint.

In 1938, hundreds of mysterious stone disks were found in a cave in China. Some believe the stones are proof of contact with an alien race. Fact or fiction?

Could claims of 'The Nine' - a federation of extraterrestrial beings who monitor and influence mankind - have any substance? Some experts believe so.

Nazi loot. Roman coins. Viking artefacts. Spanish gold. These are just some of the priceless treasures that regularly pass through the hands of the worlds most prolific yet completely unknown treasure hunters, Hamilton White and Carl Cookson.

Ross tries to find out more about his sea-faring Great Grandfather, Arthur Pop Chalmers. He discovers that Pop served in the Merchant Navy and survived three shipwrecks. Inspired to know more, he links up with maritime archaeologist, Mallory Haas.

Within our immense universe lies a world of tiny particles. From strange ghostly neutrinos that pass right through matter to mysterious objects like MACHOs and WIMPs, find out how this miniature world might hold the key to understanding the cosmos.

We tap into the history of electricity to find out if a giant structure rusting away in the contaminated zone around Grenoble could have started World War III.

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

Carl and Hamilton investigate a Crusader sword and helmet that date back more than 900 years. Then, travelling to Italys 'floating city', they learn more about how and why Venice adopted St Mark as its patron saint.

In 1938, hundreds of mysterious stone disks were found in a cave in China. Some believe the stones are proof of contact with an alien race. Fact or fiction?

Could claims of 'The Nine' - a federation of extraterrestrial beings who monitor and influence mankind - have any substance? Some experts believe so.

Nazi loot. Roman coins. Viking artefacts. Spanish gold. These are just some of the priceless treasures that regularly pass through the hands of the worlds most prolific yet completely unknown treasure hunters, Hamilton White and Carl Cookson.

Ross tries to find out more about his sea-faring Great Grandfather, Arthur Pop Chalmers. He discovers that Pop served in the Merchant Navy and survived three shipwrecks. Inspired to know more, he links up with maritime archaeologist, Mallory Haas.

Within our immense universe lies a world of tiny particles. From strange ghostly neutrinos that pass right through matter to mysterious objects like MACHOs and WIMPs, find out how this miniature world might hold the key to understanding the cosmos.

We explore some of the worlds strangest abandoned roads and transport links, and ask, why did survival in WWI come to depend on a narrow track cut into a sheer cliff face?

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.

This time, Carl and Hamilton investigate an extraordinary collection of Celtic gold from the Iberian peninsula that dates back thousands of years. Amongst the artefacts are a gold bowl worth over L1 million and a stone altar to the god Endovelicus.

In December 1980, NATO personnel stationed in England witnessed strange lights in the sky. Aliens?

Ancient astronaut theorists suggest that evidence of extraterrestrial visitation exists in every corner of the Earth, but some say the most compelling can be found in one of the world's least accessible places - China.

Chasing accounts of giant skeleton discoveries, Jim and Bill Vieira follow in the footsteps of Abraham Lincoln, who was fascinated by tales and legends of ancient colossi.

A towering structure with an explosive past; a deserted cityscape; a mysterious top-secret facility; a vast Nazi construction. Now they lie disused, contaminated and dangerous. But who built them? And why were they abandoned?

Hitch a ride on a comet as it roars from the cold, dark outer reaches of the solar system to the fiery surface of the Sun. Visit the surface of each planet, from mountains on the moons of Neptune, to the caves beneath Mars, and a solar tsunami.

We explore some of the worlds strangest abandoned roads and transport links, and ask, why did survival in WWI come to depend on a narrow track cut into a sheer cliff face?

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.

This time, Carl and Hamilton investigate an extraordinary collection of Celtic gold from the Iberian peninsula that dates back thousands of years. Amongst the artefacts are a gold bowl worth over L1 million and a stone altar to the god Endovelicus.

In December 1980, NATO personnel stationed in England witnessed strange lights in the sky. Aliens?

Ancient astronaut theorists suggest that evidence of extraterrestrial visitation exists in every corner of the Earth, but some say the most compelling can be found in one of the world's least accessible places - China.

Chasing accounts of giant skeleton discoveries, Jim and Bill Vieira follow in the footsteps of Abraham Lincoln, who was fascinated by tales and legends of ancient colossi.

A towering structure with an explosive past; a deserted cityscape; a mysterious top-secret facility; a vast Nazi construction. Now they lie disused, contaminated and dangerous. But who built them? And why were they abandoned?

Hitch a ride on a comet as it roars from the cold, dark outer reaches of the solar system to the fiery surface of the Sun. Visit the surface of each planet, from mountains on the moons of Neptune, to the caves beneath Mars, and a solar tsunami.

We explore some of the worlds strangest abandoned roads and transport links, and ask, why did survival in WWI come to depend on a narrow track cut into a sheer cliff face?