Host Michael Guillen travels to China to explore the roots of modern agricultural genius. He studies how the ancient Chinese invented advanced farming technology long before the west would use anything like it.

Marty Lagina meets with researcher Kevin Dysktra who believes hes found a trail to a fortune in Confederate gold that may lie at the bottom of Lake Michigan.

Brad and his team investigate a rumour that could reveal the truth about the American economy.

For thousands of years, human civilisation has been guided by the words and deeds of ancient prophets, but who were these prophets communicating with?

Naples is a time capsule of ancient life, with banks, bakeries and even Nero's famous stage hidden under the streets and in the caverns of Vesuvius.

Many things we associate with the practice of modern medicine were actually introduced by the ancient Egyptians more than 5,000 years ago. We travel to Egypt for a first-hand look at the birthplace of modern medicine.

Toppling giants of concrete and steel is dangerous and deadly. In demolition, one mistake can cost you your life. On this episode: imploding a casino, dismantling chemical weapons and tripping a silo.

Episode four centres on the Libation vessel. Exquisitely shaped from marble, it's Carls favourite piece from the hoard and in pristine condition; adorned with four carved heads.

Host Michael Guillen travels to China to explore the roots of modern agricultural genius. He studies how the ancient Chinese invented advanced farming technology long before the west would use anything like it.

Marty Lagina meets with researcher Kevin Dysktra who believes hes found a trail to a fortune in Confederate gold that may lie at the bottom of Lake Michigan.

Brad and his team investigate a rumour that could reveal the truth about the American economy.

For thousands of years, human civilisation has been guided by the words and deeds of ancient prophets, but who were these prophets communicating with?

Naples is a time capsule of ancient life, with banks, bakeries and even Nero's famous stage hidden under the streets and in the caverns of Vesuvius.

Many things we associate with the practice of modern medicine were actually introduced by the ancient Egyptians more than 5,000 years ago. We travel to Egypt for a first-hand look at the birthplace of modern medicine.

Toppling giants of concrete and steel is dangerous and deadly. In demolition, one mistake can cost you your life. On this episode: imploding a casino, dismantling chemical weapons and tripping a silo.

The series finale focuses on the reliquary casket. Carl and Hamilton know the casket dates to a later period - probably early 15th century. Yet a series of engravings on it - the 'box code' - appears to make veiled references to Templar beliefs.

Many things we associate with the practice of modern medicine were actually introduced by the ancient Egyptians more than 5,000 years ago. We travel to Egypt for a first-hand look at the birthplace of modern medicine.

Evidence of a possible forgotten railroad energises Kevin and his team as the pressure builds to convince Marty Lagina to join their quest in the recovery Civil War gold.

Does the Declaration of Independence contain secret messages from the founders of the United States?

Could the Anunnaki gods be more than legend? Is it possible that civilization made sudden, huge advances in development 5,000 years ago as a result of their presence on Earth?

Nine dams in Colorado are taken out by a storm, flooding entire towns and leaving thousands stranded. Toxic vapours throughout a small NJ community after a train is derailed.

A tube system starved of investment, a lacking fire policy and an inadequate smoking ban were to have tragic consequences. In 1985, a series of disastrous decisions about safety procedures at Kings Cross station led to the death of 31 people.

In less than 200 years, the Aztecs went from a tribe of nomads into the most powerful civilisation the New World had ever known. How did they achieve such greatness?

The series finale focuses on the reliquary casket. Carl and Hamilton know the casket dates to a later period - probably early 15th century. Yet a series of engravings on it - the 'box code' - appears to make veiled references to Templar beliefs.

Many things we associate with the practice of modern medicine were actually introduced by the ancient Egyptians more than 5,000 years ago. We travel to Egypt for a first-hand look at the birthplace of modern medicine.

Evidence of a possible forgotten railroad energises Kevin and his team as the pressure builds to convince Marty Lagina to join their quest in the recovery Civil War gold.

Does the Declaration of Independence contain secret messages from the founders of the United States?

Could the Anunnaki gods be more than legend? Is it possible that civilization made sudden, huge advances in development 5,000 years ago as a result of their presence on Earth?

Nine dams in Colorado are taken out by a storm, flooding entire towns and leaving thousands stranded. Toxic vapours throughout a small NJ community after a train is derailed.

A tube system starved of investment, a lacking fire policy and an inadequate smoking ban were to have tragic consequences. In 1985, a series of disastrous decisions about safety procedures at Kings Cross station led to the death of 31 people.

In less than 200 years, the Aztecs went from a tribe of nomads into the most powerful civilisation the New World had ever known. How did they achieve such greatness?

The series finale focuses on the reliquary casket. Carl and Hamilton know the casket dates to a later period - probably early 15th century. Yet a series of engravings on it - the 'box code' - appears to make veiled references to Templar beliefs.