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Bobby Bognar takes a bite out of the world of pizza to explore why bacteria is a key ingredient and how milk turns into mozzarella.

Battleships powered by bulls, arrow machine guns and even primitive computers, find out how ancient man was far more advanced than the history books suggest.

Big Bend National Park: A series of incidents in Big Bend National Park leave experts convinced of secret alien activities taking place there. (S2, ep 1)

Death Valley National Park: Discover the forces living in the secret underworld of Death Valley National Park, where a series of deaths and disappearances have taken place. (S2, ep 2)

The Rapture: When millions over the world vanish, a biblical prophecy known as the Rapture will be fulfilled. Are there signs of the prediction actually happening? (S1, ep 8)

The Gladiatrix: Emperor Trajan throws his great games of AD 107 and the crowd is treated to the rare spectacle of female gladiators. (S1, ep 4)

Zeus: Ancient Greece's most powerful god wages an epic struggle against his father for control of the universe. It's the ultimate clash in what is mythology's greatest showdown. (S1, ep 10)

Groovy Baby: Ted and Nick hit a 1960s bungalow in a celebrity neighbourhood and strike gold with a one-of-a-kind prospecting machine. (S3, ep 5)

These Boots Were Made for Salvaging: The Flashback team finds some mint vintage boot-making salvage at an old factory that could be perfect for one of Ted's favourite clients. (S3, ep 7)

Freaks Of Nature: A small community is devastated by an earth-shattering 'boom,' while an paranormal fog seems to alter the very fabric of time. (S2, ep 6)

Mysterious Vanishings: Baffling stories of people who vanished without a trace, including a young Tasmanian pilot who is chased by unidentified aircraft before disappearing. (S3, ep 8)

Halifax Explosion: When the SS Mont-Blanc and the SS Imo collided in 1917 in the harbour of Halifax, Canada, the subsequent explosion killed or injured almost 11,000 people. (S1, ep 3)

The Immortality Machine: In the Mojave Desert, there is a structure built to bestow everlasting life, and according to the architect, its blueprint is from another world. (S12, ep 30)

During the Cold War, an intelligence analyst in West Germany hears mysterious drumbeats. Meanwhile, a combat engineer encounters three unusual creatures in Oregon. (S1, ep 5)

Slaver Ship Secrets: Ross Kemp is shocked by what he discovers as he dives on the wreck of a steam-age ship in north Devon, and a potential early slaver ship in Plymouth. (S1, ep 3)

Gun Runners: Hearing about his great-grandfather who served in the Merchant Navy inspires Ross to explore the wreck of a WWII cargo ship and try to recover its military supplies. (S1, ep 4)

The Shapeshifters: Accounts of creatures that can shapeshift from one form to another can be found throughout history. But are they real and do they have otherworldly origins? (S12, ep 31)

In 1974, a Saskatchewan farmer reports seeing objects hovering in a field before they vanish into the ether. Connecticut citizens witness strange lights and a giant UFO in 1984. (S1, ep 13)

Two cousins encounter a "mothership" three times the size of a football stadium in 1996. In 1967, guards at an air force base in Montana spot a UFO and all hell breaks loose. (S1, ep 1)

Forbidden Caves: Could Earth's deepest caves hide secret conduits to other worlds? Or harbour evidence that aliens once visited our planet? Experts investigate. (S7, ep 3)

The Sodder Children Disappearance: On Christmas morning 1945, five siblings vanish from their family home in West Virginia as a fire blazes. What happened is still a mystery. (S3, ep 8)

Agriculture: What do the plans to terraform Mars and the ancient Egyptians' irrigation of the River Nile have in common? Find out why no agriculture would mean no culture at all.

Aliens Among Us: Are we being watched by otherworldly beings? Experts make surprising discoveries as they explore the ancient past for evidence of alien overseers. (S7, ep 4)

Russia Declassified: Have the US and Russia been working together from the beginning of the Space Race in preparation for the ultimate extraterrestrial encounter? (S11, ep 10)

Aliens And Dinosaurs: Theorists investigate a depiction of a stegosaurus found at Angkor Wat in Cambodia. Could it suggest that alien species killed off the dinosaurs? (S4, ep 13)

Bakers Creek - Australia's Worst Crash: Australia's worst aviation accident happened in 1943 when 40 crew died in a B-17 bomber crash. (S1, ep 3)

Cap Arcona: Discover the fate of the SS Cap Arcona, a former luxury ship turned prisoner transport vessel that became the target of an RAF squadron attack. (5 of 6)

A look at the first weeks of a war that would disrupt the lives of so many, starting with the first shots fired by the Japanese in July 1937, China. (S1, ep 1)

Giorgio Tsoukalos takes a look back at the most compelling investigations of all, and events that he believes represent real encounters with extraterrestrial visitors.

The Genius Factor: History's greatest geniuses have often said their ideas came from visions or hallucinations. But could they have come from aliens? Experts investigate. (S7, ep 5)

D-Day Dress Rehearsal: In 1944 the south west of England was packed with American troops training for D-Day. Suggs and Stephen discover more about this friendly invasion. (S2, ep 7)

Stirling: Stirling has long been one of the most strategically important castles in Britain. Dan Jones examines the rich and savage history of this stronghold. (S1, ep 5)

Plantagenet Canterbury: Alice studies the history of Canterbury, learning the true horror of the Black Death and exploring the iconic cathedral. (5 of 6)

Japan: Travel through time to explore the past 1500 years of one of the world's most unique and diverse ancient cultures - Japan. (S1, ep 10)

America: Once the flagship in the United States Lines, the SS America served her owners for 55 years until she was unceremoniously left abandoned in the Canary Islands. (6 of 6)

Snapshot: Ten glassblowers take up the challenge to make a piece of art that represents who they are, by using photographs from their past. (S1, ep 1)

Potluck Party: The remaining contestants create masterpieces such as a bento box and a glass taco stand in a food-themed challenge. (S1, ep 2)

The Romans: An awe-inspiring year of archaeological digs with Dr Alice Roberts. Roman finds include an amazing coin hoard and a man buried on a pile of dead animals. (S1, ep 1)

Dawn of the Celts: 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 3)

SS Clare Lilley: For decades, residents in Nova Scotia have reported munitions washing up on their shores - believed to have come from the wreck of the SS Clare Lilley. (S1, ep 4)

...Changed Britain. King's Cross Fire: James Nesbitt heads to London to shed light on the devastating 1987 King's Cross fire, which killed 31 people and injured 100. (S1, ep 5)

Hundred Tiny Screams: Adam thinks he's getting his revenge on Rob for selecting tarantulas by programming Rob's phobia: centipedes. (S2, ep 5)

Giorgio Tsoukalos takes a look back at the most compelling investigations of all, and events that he believes represent real encounters with extraterrestrial visitors.

The Genius Factor: History's greatest geniuses have often said their ideas came from visions or hallucinations. But could they have come from aliens? Experts investigate. (S7, ep 5)

The Romans: An awe-inspiring year of archaeological digs with Dr Alice Roberts. Roman finds include an amazing coin hoard and a man buried on a pile of dead animals. (S1, ep 1)

The U-Boat Terror: Inspired by the story of his two cousins that died at sea in WWII, Ross Kemp heads up to Scapa Flow where he finds treasure that could link back to his family. (1 of 4)

Japan: Travel through time to explore the past 1500 years of one of the world's most unique and diverse ancient cultures - Japan. (S1, ep 10)

Plantagenet Canterbury: Alice studies the history of Canterbury, learning the true horror of the Black Death and exploring the iconic cathedral. (5 of 6)

Alien Messages: Could extraterrestrials have left us clues to the universe's mysteries? Experts investigate cryptic puzzles that might have been left by ancient aliens. (S7, ep 7)

Mystery Of Puma Punku: No one knows who designed and built Bolivia's sophisticated temple complex. Could it have been aliens? Experts investigate. (S4, ep 14)

The Turweston Crash - Death in the Moonlight: In 1944, two Wellington bombers collided in mid-air over Northants. Garth Barnard investigates why 13 young trainees perished. (S1, ep 4)

America: Once the flagship in the United States Lines, the SS America served her owners for 55 years until she was unceremoniously left abandoned in the Canary Islands. (6 of 6)

Between September 1940 and November 1941, things intensify as Nazi Germany exert their dominance over Europe. (S1, ep 2)

Giorgio Tsoukalos takes a look back at the most compelling investigations of all, and events that he believes represent real encounters with extraterrestrial visitors.

Secrets Of The Mummies: Experts investigate the mysterious origins of mummification. Could this global practice be proof that aliens once visited Earth? (S7, ep 6)

The U-Boat Terror: Inspired by the story of his two cousins that died at sea in WWII, Ross Kemp heads up to Scapa Flow where he finds treasure that could link back to his family. (1 of 4)

Carrickfergus: Dan visits one of Northern Ireland's oldest castles, Carrickfergus, to learn more about the tempestuous relationship between Britain and Ireland. (S1, ep 6)

Stewart Sturling: Alice explores the story of Stewart Britain by visiting the home of the Scottish royals who eventually took the English throne in 1603 and created Great Britain. (6 of 6)

Ancient Greece (Part 1): Explore the great historic sites of the Minoan civilisation on Crete, Mycenae in the Peloponnese and the emerging Greek city states such as Corinth. (S2, ep 1)

Achille Lauro: A ship with incredible misfortune, the MS Achille Lauro suffered two serious collisions, multiple onboard fires and was even hijacked by PLO terrorists in 1985. (S2, ep 3)

Lighten Up: The eight artists are challenged to make a light fixture using techniques such as colour wrapping, hot sculpting and making bubbles with baking soda. (S1, ep 3)

Clash of the Robots: The seven contestants put their skills into making a glassy robot prototype that can preform chores and tasks. (S1, ep 4)

Prehistory: 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. (S1, ep 2)

The Art and War: 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 3)

Nuclear Stand Off: A Greenpeace ship is bombed in 1985, killing Fernando Pereira. The French authorities deny responsibility and questions over nuclear restrictions arise again. (S2, ep 5)

During the Cold War, an intelligence analyst in West Germany hears mysterious drumbeats. Meanwhile, a combat engineer encounters three unusual creatures in Oregon. (S1, ep 5)

Big Bend National Park: A series of incidents in Big Bend National Park leave experts convinced of secret alien activities taking place there. (S2, ep 1)

Death Valley National Park: Discover the forces living in the secret underworld of Death Valley National Park, where a series of deaths and disappearances have taken place. (S2, ep 2)