The greatest monuments of the world show more than wealth - they show power. From the secrets of Stonehenge to the jaw dropping temple of Karnak, which of these archaeological sites will be crowned the most jaw-dropping monument of the ancient world?

Among the most notable battleships in the US Navy's history is the USS New Jersey. The ship's sponsor was Mrs Charles Edison, wife of the Governor of New Jersey and daughter-in-law of Thomas Edison.

Hidden tunnels that saw a city prosper; a sunken wreck with a remarkable past; a concrete wartime dome; a mysterious cold war building. Now they lie disused, contaminated, and dangerous. But who built them? And why were they abandoned?

The US military has long claimed that the 1947 Roswell crash was a weather balloon, but FBI files released in 2011 include a memo regarding the recovery of not one, but three 'flying saucers'. Could the US government have UFOs in their possession?

Excitement soars when Kevin finally holds gold brought home from the arrest of Jefferson Davis, convincing him that his theory is true.

Hunting for the Lost Dutchman is usually a one-man journey, but Wayne Tuttle is partnering with a team of experts to follow a newly-revealed clue that could finally solve the 500-year-old mystery of America's most famous buried treasure.

Sightings of small creatures have coincided with missing persons reports within the Alaska Triangle. Could man-eating gnomes be roaming Alaska?

Warp speed, transporters, wormholes and lasers are all staples of science fiction books, movies, and TV shows. But the fantastic world of tomorrow is quickly becoming the futuristic world of today.

The greatest monuments of the world show more than wealth - they show power. From the secrets of Stonehenge to the jaw dropping temple of Karnak, which of these archaeological sites will be crowned the most jaw-dropping monument of the ancient world?

Among the most notable battleships in the US Navy's history is the USS New Jersey. The ship's sponsor was Mrs Charles Edison, wife of the Governor of New Jersey and daughter-in-law of Thomas Edison.

Hidden tunnels that saw a city prosper; a sunken wreck with a remarkable past; a concrete wartime dome; a mysterious cold war building. Now they lie disused, contaminated, and dangerous. But who built them? And why were they abandoned?

The US military has long claimed that the 1947 Roswell crash was a weather balloon, but FBI files released in 2011 include a memo regarding the recovery of not one, but three 'flying saucers'. Could the US government have UFOs in their possession?

Excitement soars when Kevin finally holds gold brought home from the arrest of Jefferson Davis, convincing him that his theory is true.

Hunting for the Lost Dutchman is usually a one-man journey, but Wayne Tuttle is partnering with a team of experts to follow a newly-revealed clue that could finally solve the 500-year-old mystery of America's most famous buried treasure.

Sightings of small creatures have coincided with missing persons reports within the Alaska Triangle. Could man-eating gnomes be roaming Alaska?

Modern ore processing machines are the largest, most sophisticated of their type in the world. When they wear out, they join the boneyards, waiting to be restored or scrapped for the furnace.

When the Vieira brothers head west to explore an island shrouded in mystery, they uncover compelling evidence of giants, but their investigation takes a dark turn.

Pulsars are tiny - only a few miles across - but they spin as fast as a kitchen blender and sweep the sky with beacons of radiation that make them appear to flash on and off. Quasars are at the other end of the spectrum.

A top-secret Nazi project - Die Glocke, was believed to be a time travel device that could soar through the sky and eventually reach the speed of light and beyond. Did Die Glocke actually exist, and could it have been based on alien technology?

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

This episode chronicles several close encounters with alien abductees who have been held captive, probed, examined, and had objects implanted in their bodies.

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

From crocodiles to lions, how did these ultimate killing weapons develop over time?

Modern ore processing machines are the largest, most sophisticated of their type in the world. When they wear out, they join the boneyards, waiting to be restored or scrapped for the furnace.

When the Vieira brothers head west to explore an island shrouded in mystery, they uncover compelling evidence of giants, but their investigation takes a dark turn.

Pulsars are tiny - only a few miles across - but they spin as fast as a kitchen blender and sweep the sky with beacons of radiation that make them appear to flash on and off. Quasars are at the other end of the spectrum.

A top-secret Nazi project - Die Glocke, was believed to be a time travel device that could soar through the sky and eventually reach the speed of light and beyond. Did Die Glocke actually exist, and could it have been based on alien technology?

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

This episode chronicles several close encounters with alien abductees who have been held captive, probed, examined, and had objects implanted in their bodies.

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

From crocodiles to lions, how did these ultimate killing weapons develop over time?

Modern ore processing machines are the largest, most sophisticated of their type in the world. When they wear out, they join the boneyards, waiting to be restored or scrapped for the furnace.