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Did a biblical patriarch receive instructions from 200 angels, and was Egypt's most controversial Pharaoh an extraterrestrial being.

Ancient astronaut theorist Giorgio Tsoukalos takes a look back at some of the most mysterious yet incredible creatures ever investigated.

Sacred buildings around the world begin to crumble without humans to maintain them. Clues about the planet's future lie in an abandoned desert town.

Series exploring the role of trains in the major conflicts of the past 150 years. Auschwitz survivors explore the railways' part in the Nazis' mass murder.

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.

Did a biblical patriarch receive instructions from 200 angels, and was Egypt's most controversial Pharaoh an extraterrestrial being.

Ancient astronaut theorist Giorgio Tsoukalos takes a look back at some of the most mysterious yet incredible creatures ever investigated.

Galen of Pergamon makes a name for himself as a physician for gladiators. Meanwhile, a devastating plague sweeps through the city.

Just one of Rome's emperors is willing to step out of the Imperial Box into the arena and his name is Commodus, a man with a reputation for making enemies.

A divided Roman Empire is rocked by devastating earthquakes, fires, barbarian invasions and religious divides. Meanwhile, as Rome declines, the Colosseum lies empty.

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.

Emperor Domitian tasks master builder Haterius with constructing a labyrinth underneath the Colosseum floor.

The Pyramids of Giza could be a map of the stars. First responders bring hope during Hurricane Katrina. An Indonesian volcano erupts in a shade of blue.

The team analyses incredible NASA footage of reported UFOs, and interviews former NASA employees who allegedly witnessed cover ups first hand.

In 1923, Adolf Hitler led the infamous Beer Hall Putsch, an attempt to take power in Germany by force. It was a day that would change the world forever, birthing Hitler's regime.

With more than 300 UFO sightings each year, the people living within the Falkirk Triangle can't help but feel uneasy about the strange occurrences.

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

Did a biblical patriarch receive instructions from 200 angels, and was Egypt's most controversial Pharaoh an extraterrestrial being.