Some of the world's leading physicists believe they have found evidence proving the existence of parallel universes.

In this episode we explore the theory that Stonehenge may be a prehistoric astronomical observatory. Ancient astronomer priests may have divined the complex movements of the Sun and Moon, recognising patterns that would not be discovered elsewhere.

In 9 AD, a ferocious Germanic chieftain, Arminius, slaughtered General Varus' army at the Teutoburg Forest in a landmark battle that would define the edge of the empire.

Journey to China, home to one of the oldest and most famous martial arts of all - Kung Fu. From Beijing to the Great Wall, our hosts will travel this vast country, learning techniques from some of the greatest living masters.

Is it possible that an advanced civilisation inhabited Earth thousands of years ago? Could the stories of a time when gods and otherworldly beings inhabited the planet be more than just mythology?

As Emperor of Spain, Gaul and Britain, Constantine proved himself as a leader and changed western civilisation forever, turning the empire towards Christianity.

A single train crossing was the site of not one, but two disastrous auto collisions in a single year. How could this happen?

An American symbol lost to the jungle. Concrete monoliths in a European forest. A vast cold war relic. A bizarre structure built to speed trade. Who built them? And why were they abandoned?

Some of the world's leading physicists believe they have found evidence proving the existence of parallel universes.

In this episode we explore the theory that Stonehenge may be a prehistoric astronomical observatory. Ancient astronomer priests may have divined the complex movements of the Sun and Moon, recognising patterns that would not be discovered elsewhere.

In 9 AD, a ferocious Germanic chieftain, Arminius, slaughtered General Varus' army at the Teutoburg Forest in a landmark battle that would define the edge of the empire.

Journey to China, home to one of the oldest and most famous martial arts of all - Kung Fu. From Beijing to the Great Wall, our hosts will travel this vast country, learning techniques from some of the greatest living masters.

Is it possible that an advanced civilisation inhabited Earth thousands of years ago? Could the stories of a time when gods and otherworldly beings inhabited the planet be more than just mythology?

As Emperor of Spain, Gaul and Britain, Constantine proved himself as a leader and changed western civilisation forever, turning the empire towards Christianity.

A single train crossing was the site of not one, but two disastrous auto collisions in a single year. How could this happen?

An American symbol lost to the jungle. Concrete monoliths in a European forest. A vast cold war relic. A bizarre structure built to speed trade. Who built them? And why were they abandoned?

Some of the world's leading physicists believe they have found evidence proving the existence of parallel universes.

In this episode we explore the theory that Stonehenge may be a prehistoric astronomical observatory. Ancient astronomer priests may have divined the complex movements of the Sun and Moon, recognising patterns that would not be discovered elsewhere.

In 9 AD, a ferocious Germanic chieftain, Arminius, slaughtered General Varus' army at the Teutoburg Forest in a landmark battle that would define the edge of the empire.

Journey to China, home to one of the oldest and most famous martial arts of all - Kung Fu. From Beijing to the Great Wall, our hosts will travel this vast country, learning techniques from some of the greatest living masters.

Is it possible that an advanced civilisation inhabited Earth thousands of years ago? Could the stories of a time when gods and otherworldly beings inhabited the planet be more than just mythology?

As Emperor of Spain, Gaul and Britain, Constantine proved himself as a leader and changed western civilisation forever, turning the empire towards Christianity.

A single train crossing was the site of not one, but two disastrous auto collisions in a single year. How could this happen?

An American symbol lost to the jungle. Concrete monoliths in a European forest. A vast cold war relic. A bizarre structure built to speed trade. Who built them? And why were they abandoned?

Could we ever travel faster than the speed of light?

The Great Pyramids of Giza have eluded astronomers and archeologists for centuries. The world's renowned Egyptologists, astronomers and engineers join forces to solve some of the long-held mysteries about the pyramids.

In 47 AD, new emperor Claudius was considered by many to be an idiot. The only way for him to hang onto his throne was to invade Britannia.

The hosts journey to Moscow, Russia, the origin of one of the most versatile and deadly martial arts on the planet, created at the instigation of Lenin during the Bolshevik Revolution to improve the combat skills of the military and the police.

Did aerospace engineer Wernher von Braun have secrets collected by the Nazis in WWII, or access to technology recovered from Roswell? Is it possible that the world's greatest rocket scientist found his inspiration not on our world, but another?

Hannibal's merciless attacks on Roman soil deal a near fatal blow to the future Empire. Sworn to a blood oath, Hannibal of Carthage does the unthinkable, marching 40 war elephants and an army over the Alps to gain the element of surprise.

It's early morning in Saqqara and Zahi is getting ready to open two sealed tombs for the first time in thousands of years, but Zoe is late again and his patience is wearing thin.

A mega factory is a modern invention? Wrong - the ancients were the first to build these thousands of years ago. We reveal the impossible ingenuity and techniques that made it possible for the ancients to have "Mega Factories" of their own.

Could we ever travel faster than the speed of light?