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Thousands of UFO sightings and abductions are reported every year. This series examines these accounts and casts new light on historic cases.

Is our planet prepared for an extraterrestrial invasion of disease? And could past plagues have been brought to Earth by aliens? Experts investigate.

Experts explore animal mutilations and alien abductions as they ask whether extraterrestrials could be altering human DNA.

Beverley Allitt was thought to be a 'model' nurse. Very astute, caring and always willing to help, why did she murder four children and attempt to kill 11 others.

Dive into the 'game changing' ships that turned the tide of war and made history, from the grand USS Constitution to the small and speedy CMB-4.

It was a battle that lasted only five hours, but Britain's fight against Spain and Napoleon Bonaparte's France would go down in history.

Looking at early metal warships, and how HMS Rattler's screw propeller in 1845 would lead to the revolutionary HMS Dreadnought in the 20th Century.

A palm reader predicts that the guys will have a productive visit to Quebec, but one reluctant dealer could spoil their plans.

Did prophets such as Elijah and Joseph Smith communicate with a heavenly source or did they actually come into contact with extraterrestrials.

Ancient alien theorists explore the mysterious phenomena of the Nazca Lines. Could these huge geoglyphs in Southern Peru have an extraterrestrial connection.

On 19 August 1987, Michael Ryan went on a bloody rampage in the village of Hungerford. Ryan shot and killed 16 people, and his crime would change the face of Britain.

The story of Yorkshire Ripper Peter Sutcliffe, who murdered 13 women during a five-year killing spree that began in 1975.

While the allies aim to end Hitler's domination of Western Europe, British troops are secretly being trained for an enormous, amphibious operation. (1 of.

In June 1944, the Allied armada launches an assault on the Normandy coast, with soldiers charging in successive waves on a successful and historic day. (2 of.

Humans are found to have lived in Britain earlier than thought when tools are unearthed in Norfolk, while some of our ancestors' customs are revealed at another dig.

Al joins forces with German comedian Henning Wehn to delve deeper into the truth behind some World War II myths.

Did prophets such as Elijah and Joseph Smith communicate with a heavenly source or did they actually come into contact with extraterrestrials.

Ancient alien theorists explore the mysterious phenomena of the Nazca Lines. Could these huge geoglyphs in Southern Peru have an extraterrestrial connection.

Follow the story of General Marius, who transformed the Roman army and sent shock waves through Rome by offering dictatorship or annihilation.

As the Roman generals lead their mighty legions into the lands surrounding Italy, none could anticipate the turmoil caused by one bold mercenary - Spartacus.

Roman emperor Titus plans 100 days of games to commemorate the Colosseum's completion in 80 AD, including a fight to the death between Priscus and Verus.

The eight year-old's disappearance and murder shocked the nation. Here, Sarah's mum reveals her tireless campaign to protect other children from paedophilia.

Roman emperor Titus plans 100 days of games to commemorate the Colosseum's completion in 80 AD, including a fight to the death between Priscus and Verus.

From secret nuclear programs to hidden Cold War bunkers, we uncover the surprising people and places behind top-secret discoveries.

Earth's Evil Twin: Earth's neighbour has volcanoes, clouds of acid rain and a surface temperature hot enough to melt lead - so is Venus our evil twin.

Did prophets such as Elijah and Joseph Smith communicate with a heavenly source or did they actually come into contact with extraterrestrials.