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The world's most incredible engineering projects are revisited to uncover why places full of mysteries and untold secrets are now abandoned ruins.

Structures of steel and iron eerily stand unfinished after they were abandoned midway in construction, covered in weeds, moss and rust, the show explores what they could have been.

Jamie Theakston attempts to uncover the truth about historical mysteries, ancient relics, hidden treasures, conspiracy theories and lost civilizations. Have these stories been omitted from the history books?

Explore the intense and sometimes deadly relationship between twins. How does a closeness generally seen as positive thing turn into something much darker?

Scattered across the United States are abandoned structures, forgotten ruins of the past and monuments to a bygone era that reveal the secrets of a hidden America.

The series traces and sifts through the remains of the Medieval Dead. Specially assembled experts Tim Sutherland, Malin Holst and Simon Richardson travel battlegrounds and battlefields, towns and villages, churches and burial grounds to search for clues hidden in the bones of the dead from medieval time.

A look though the private lives of the Tudor monorachs

Meet the architects behind the Nazi war machine. The Führer's most prominent planners, designers, architects, and builders tried to downplay their role in the Holocaust, but the truth is now exposed.

The iconic images of the monarchs, frequently captured in famous portraits and paintings, are part of the very fabric of national culture, in carefully-arranged poses. This is all well and good, but actually, they were all just human beings, with the same ticks and foibles, bad habits and weaknesses, as the rest of us.

In this six-part series, battlefield historians and military experts utilise cutting edge, drone mounted technology to re-examine some of the second world war's most iconic sites.

Royal Murder Mysteries is a hard-hitting upcoming series investigates all of these extraordinary stories, sifting through the evidence, the facts as it seeks to reach final conclusions and numerous theories surrounding royal deaths.

The KKK, The Priory of Sion, The Order Of Assassins - the names might be familiar but - Who were they? What were they? What were their beliefs and aims? This six episode series explores some of the most secretive and dangerous global underworld societies from history. It's a murky, mysterious mixture of sectarian cults, fanatical religious groups, esoteric societies and political militants - all of them seeking to shape and influence the world we know today.

A fascinating series looking at some of the most shocking and unusual cases connected with the Nazi reign. From the suspicious death of Hitler's niece to the corrupt murder investigation that linked a former King to Nazi money.

It looks at some of the most common everyday items around us and the surprising ways they got their start. How we make and use many items reveals fascinating stories.

Sir Tony Robinson presents this documentary series in which he travels the world to explore the most unusual and innovative machines and vehicles in this series which is packed with exciting stunts and epic challenges.

For centuries, explorers have searched for the Bible's most sacred religious artefacts. One of the most mysterious of these objects is the famed Ark of the Covenant. The gold-plated wooden chest - one of the most instrumental symbols of faith and God's presence - was believed to house the two tablets bearing the Ten Commandments. The Ark's exact whereabouts has long puzzled scholars. Where did it go? And why has it remained such a mystery? Secrets of the Lost Ark follows a team of experts using the latest science and research in search of answers.

Join host Dr. Tracy Borman as she examines Henry VIII's life from birth to death and those of the men around him.

It's probably the greatest historical "what if?" of all time. A question that fascinates and horrifies in equal measures: what if Nazi Germany had won the Second World War? In this brand-new and exclusive six-part series, author and historian Guy Walters reveals how Hitler had already started to implement plans of world domination long before the war had started and explores how the Fuhrer intended to carry them out, regardless of the human cost.

Documentary series examining the Industrial revolution, the age of smoke and steel, a time when history's great engineers pioneered solutions that would forever change the way people live, think, and build.

Dr Tracy Borman goes behind closed doors to reveal the private lives of six historical figures

Many of the world's most spectacular railways are surrounded by mysterious stories, tales and sagas. But these back stories have been lost to the passing years and are now unknown even to those using the railways daily.

From the persecution of religions and beliefs to the torture and execution of witches, it chronicles the atrocities that have been perpetrated in the name of faith.

This series takes the viewer on a journey through the sixties, seventies, and eighties through archive footage, and recorded testimony of the time, as we rediscover the decades that defined us.