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Violence erupts as the Romans and Barbarians try to co-exist in the empire. The Goths rebel under the leadership of Alaric, a man they call king.

A look at cases where people have claimed strange voices urged them to commit horrific deeds. Could they have been obeying the orders of aliens.

Experts investigate whether ancient tales of beings with super-human powers could be inspired by extra-terrestrials who came to Earth in the past.

Some places are known for so many reports of UAP sightings that people flock from all around the world, just to catch a glimpse of a flying saucer.

UAPs have been seen entering the ocean at high speeds - and since our oceans can be as deep as six miles, were the UAPs simply trying to get home.

A journey to some of the mysteries of how the early Celts emerged and expanded, from collapsed salt mines, to bizarre rituals and lost cities. (1 of.

In the East of Britain, Dr Alice Roberts finds new revelations from 'Britain's Pompeii' and the theatre where Shakespeare premiered Romeo and Juliet.

Discover over a hundred massive concrete arrows scattered across America, a mysterious hole in the middle of a lake in Southern California and more.

Mike and Avery try to get an auctioneer to help them downsize their collections but Avery scares him off.

Experts scrutinise prehistoric ruins, asking whether humans could have built these advanced structures alone. Might they have had alien help.

Inventor Nikola Tesla claimed to have direct communication with beings on other planets. Could this genius scientist have been a human 'receiver'.

Himmler's belief in the theory that the Himalayas were home to the Nazis' Aryan ancestors leads to an SS mission to the mountains.

Two of the most produced combat machines in World War II managed to stay relevant until the end of the war through constant modernization and new variants.

The mighty North American twin delivered the first blow in the fight back against Japan, in one of the most daring and audacious raids of all time.

Experts scrutinise prehistoric ruins, asking whether humans could have built these advanced structures alone. Might they have had alien help.

Inventor Nikola Tesla claimed to have direct communication with beings on other planets. Could this genius scientist have been a human 'receiver'.

As the Fermi Paradox states, the likelihood of advanced life in the universe is surprisingly high - so why haven't we had any contact with extraterrestrial life.

Physical evidence of alien activity has been hidden from the public for years - but it is starting to be revealed.

After thriving for three centuries, the Celts turned from traders into proven warriors, weapon masters and metal artists in a time that became their golden age. (2 of.

Viking Camp and Iron Age Gold: Dr Alice Roberts explores the most exciting finds from West Britain. Iron Age gold in Britain is unearthed and a Viking camp is discovered.

A Turkish drought reveals a long-lost Basilica and its secrets, while the hull of a ship in the North Sea answers decades-old questions.

Check out a heart patient's unbelievable transformation, circles of ice in rivers and a shocking DNA test.

Worm in the Sky, Skeletal Mystery Remains and Thessaloniki Mystery Sounds: What causes the thunderous banging noises that wake Thessaloniki residents every night.

Two of the most produced combat machines in World War II managed to stay relevant until the end of the war through constant modernization and new variants.

The mighty North American twin delivered the first blow in the fight back against Japan, in one of the most daring and audacious raids of all time.

The story of a deadly war that intertwines Germany, Poland, Japan, Italy and Spain, and the remorseless development of weapons and bombers. (6 of.

A look at the women who surrounded Hitler after he came to power and how they were held up as an Aryan ideal for German society to strive for.

Experts scrutinise prehistoric ruins, asking whether humans could have built these advanced structures alone. Might they have had alien help.