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Tower of Skulls: At Mexico City's Templo Mayor, archaeologists uncover a 15th-century tower of 600 skulls, revealing new insights into Aztec sacrifice and ritual. (S1, ep 2)

Alaska: A powerful earthquake in 2018 seemed to lead to an increase in UFO sightings in Alaska - but why? Do the extra terrestrials have something to protect here? (S1, ep 3)

Stephenville: In 2008, a shadow was cast over Stephenville, Texas, when a UFO passed overhead at supersonic speed. Craig and Sarah speak to an eyewitness and investigate. (S1, ep 9)

Queensland's Tropical Coast: Delve into the incredible collection of UFO stories of first-hand witnesses, from flying saucers to strange encounters in sugar cane fields. (S1, ep 1)

Experts investigate evidence suggesting that aliens have created the means for controlling humanity. They find that the shocking truth might be hidden right inside you. (S1, ep 9)

Could Hitler's crazed quest for world domination have been influenced by aliens? Experts reveal the extraterrestrial secret Hitler may have been hiding and where it is now. (S1, ep 10)

When the people of a thriving Midwestern town suddenly disappear, they leave behind an eerie ghost town with a dark secret. (S7, ep 5)

Experts unseal the truth about the potential aliens living and working among us. Who has come in peace? And who has a more sinister motive in mind? (S1, ep 11)

Experts investigate the mystery of the Solway Firth Spaceman - a spacesuit-clad figure who strangely appeared in a photograph taken in Cumbria. (S1, ep 12)

Time Traveller, American Stonehenge, Plant Perception: Check out mind-reading plants, pagan human sacrifice and Californian time travellers. (S1, ep 6)

Bullet Proof Boobs, Amazing Coincidences, Directional Cows: Cows align with the Earth magnetic fields, and a young makes an incredible connection. (S1, ep 8)

Somerset: Andy searches for dragons in Somerset, visits the grave of Arthur and Guinevere and tests the healing waters of a spring once used to wash the Holy Grail. (S1, ep 5)

Gloucestershire: Andy receives military training at a Civil War re-enactment, before embarking on a ghostly hunt and meeting the man who captured leopard DNA from a sheep kill. (S1, ep 7)

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)

Cardiff: Dan Jones explores the history of Cardiff castle over more than 2,000 years and reveals how it transformed into a lavish Victorian home. (2 of 5)

Aerial images reveal a strange dark stain covering a coastal town. (S7, ep 7)

Experts uncover a labyrinth that could lead them to the secrets of Imhotep. (S7, ep 8)

UFOs over LA: February 1942, and the sky over Los Angeles erupts as anti-aircraft guns begin firing on strange targets. Could this have been an extraterrestrial raid? (1 of 6)

Red Alert: During the Cold War, strange lights and unidentified objects put governments around the world on red alert. Could extra-terrestrials have been responsible? (2 of 6)

Experts investigate if a mysterious caller had inside knowledge about the assassination of President John F Kennedy. (S1, ep 14)

Experts investigate why religious apparitions appear on seemingly normal objects to seemingly normal people. Is it blind faith or supernatural phenomena? (S1, ep 17)

Tower of Skulls: At Mexico City's Templo Mayor, archaeologists uncover a 15th-century tower of 600 skulls, revealing new insights into Aztec sacrifice and ritual. (S1, ep 2)

The Vanishing of Flight CS-59: From a secret underground military facility in Greenland to a grisly collection of human remains in the Andes, explore more secrets in the ice. (S1, ep 2)

A Serial Killer in Berlin: This is the true story of how the German police were caught in a race against time to catch a depraved and psychotic killer. (S1, ep 3)

Who Put Bella in Wych Elm: The dark tale of the skeleton of a woman found in a hollowed-out tree in Birmingham woodland, exploring the links between her and Nazi spy rings. (S1, ep 4)

The Vanishing of Flight CS-59: From a secret underground military facility in Greenland to a grisly collection of human remains in the Andes, explore more secrets in the ice. (S1, ep 2)