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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)

Russia's Secret Files: Russia spans over six million square miles of some of the most rugged terrain on Earth, much of which is uninhabited and largely unexplored. (S9, ep 12)

The Animal Agenda: Going by ancient cultures' depictions of gods appearing as animals, could it be that extraterrestrials bear more resemblance to animals than humans? (S10, ep 11)

Alien Messages: Could some of our ancient texts and structures be home to secret messages left by alien ancestors? If so, what can we learn from them? (S1, ep 6)

King's Lynn, Norfolk: Hugh and the team solve a 17th-century mystery in King's Lynn as they hunt for defensive earthworks from the English Civil War. (S3, ep 2)

Ice Age Camp and a Saint With Syphilis: Alice investigates an Ice Age camp, the mystery of a medieval skeleton and the earliest evidence of salt making in Britain. (S10, ep 6)

Perplexing Patterns: Explore a psychedelic swirl in the Utah wastelands, a bizarre configuration of circles in the Sahara and a remote polka-dot lake in Canada. (S3, ep 7)

Grumps and Grinders: There's fertile picking in the Fraser Valley when the guys stop in to scour a hangar-sized collection of Canadiana. (S1, ep 13)

Beyond Roswell: The US military has denied that the 1947 Roswell crash was anything other than a weather balloon, but FBI files include a memo that indicate otherwise. (S9, ep 13)

The Replicants: While many believe in reincarnation, experts suggest that extraterrestrials designed the human body to be a vessel for otherworldly beings. (S10, ep 12)

Genocide 1942-1944: Along with Treblinka and Majdanek, Sobibor was one of the camps used in Operation Reinhard, in which the Nazis murdered almost two million people. (S1, ep 8)

If You Wish For Peace, Prepare For War: Small arms production hit a boom in the early 1800s with the emergence of the modern cartridge; an invention that led to the lethal package. (1 of 3)

The Killer Code: The Zodiac Killer Code reveals the desperate bid to crack the crazed codes sent by America's most mysterious serial killer. (S1, ep 2)

Beyond Roswell: The US military has denied that the 1947 Roswell crash was anything other than a weather balloon, but FBI files include a memo that indicate otherwise. (S9, ep 13)

The Replicants: While many believe in reincarnation, experts suggest that extraterrestrials designed the human body to be a vessel for otherworldly beings. (S10, ep 12)

Secrets Of The Pyramids: Experts explore the similarities between huge pyramids across the world. Could extraterrestrials have influenced their construction and design? (S4, ep 6)

Aliens And Bigfoot: Ancient astronaut theorists hunt for evidence linking Bigfoot to alien species from the distant past. Could the ape-like giant be an extraterrestrial? (S4, ep 7)

Einstein Factor: Ancient astronaut experts believe the minds of Einstein and Galileo were superhuman. Could these historical geniuses have had extraterrestrial connections? (S4, ep 8)

Aliens And Cover-ups: In 1980, a man received a code after touching an alleged spaceship. After the sequence was translated, he was told never to speak of the incident again. (S4, ep 9)

Alien Power Plants: Ancient alien theorists ask whether the Greeks and Egyptians understood electricity. Could extraterrestrials have introduced them to such technology? (S4, ep 10)

Chupacabra, Greatest UFO Photo Ever and Mars Sounds: What's the truth behind the Chupacabra sighting? Is this the greatest UFO photo taken? What are those sounds on Mars? (S3, ep 13)

If You Wish For Peace, Prepare For War: Small arms production hit a boom in the early 1800s with the emergence of the modern cartridge; an invention that led to the lethal package. (1 of 3)

The Killer Code: The Zodiac Killer Code reveals the desperate bid to crack the crazed codes sent by America's most mysterious serial killer. (S1, ep 2)

Villainy and Vice: Science shines a light on the dark side of Ancient Egypt, from a 5,000-year-old homicide to drug-fuelled debauchery - and one very shocking revelation. (S1, ep 3)

Ancient Icons In The Modern Age: Explore the truth and lies behind ancient Egypt's best known and loved icons, including the Great Sphinx, Tutankhamun and more. (S1, ep 4)

Beyond Roswell: The US military has denied that the 1947 Roswell crash was anything other than a weather balloon, but FBI files include a memo that indicate otherwise. (S9, ep 13)