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The Treasure Within: Jeff and his team's search for the wrecks of Mary, Joseph and Neptune takes them further into uncharted territory. (S1, ep 5)

Secrets of the Sumerians: When the ancient Sumerians built their civilisation, they credited their gods - but were these powerful beings actually extraterrestrial visitors? (S16, ep 7)

Mysteries of Scotland: Home to mysterious stone circles, stories of strange beings and reported sightings, Scotland has always been an epicentre of otherworldly phenomena. (S16, ep 8)

Sometimes, the mysterious unidentified objects people see in the sky touch down and leave physical evidence behind. (S1, ep 6)

Tower of London: Dan delves into the rich past of the Tower of London, exploring inside the imposing walls that have witnessed some of the most important events in our history. (S1, ep 2)

Falkirk: Hugh and the experts attempt to uncover a lost Roman fort connected to the Antonine Wall, buried beneath the gardens of the quiet streets of Falkirk. (S2, ep 1)

Visit the plastic bottle village in Panama, discover floating boats in Greece, take a journey to Chernobyl and investigate the impact of the Centralia mine fire in Pennsylvania. (S1, ep 16)

Mexican Revolution (Part 4): Explore the Mexican Revolution in the early part of the last century, including the roles of revolutionaries Pancho Villa and Emiliano Zapata. (S2, ep 14)

Cover-Ups: What's going on in Area 51? What crashed at Roswell? And what's happening at the top-secret Dugway Proving Ground? Experts go in search of answers. (S1, ep 2)

The Devil's Swamp: The King of the Swamp investigates disturbing phenomena in a malevolent section of a swamp home to strange creatures. (S2, ep 3)

A strange structure shaped like a giant shark might point the way to a lost civilisation's Fountain of Youth. (S4, ep 20)

Syria: Since the Syrian civil war broke out in 2011, 400,000 have been killed in the conflict. Who is to blame for this and the terrible conditions in which its people live? (S2, ep 2)

Mighty Wooden Warships: We learn about life on a Tudor ship from objects found on the Mary Rose, while on HMS Victory we learn the battle-winning tactics of Admiral Nelson. (S1, ep 9)

The UFO Superhighway: With so many strange reports of UFOs, animal mutilations and more, a specific latitude north of the Earth's equator has been dubbed 'the UFO Superhighway'. (S16, ep 8)

Mystery of the Stone Spheres: Mysterious ancient stones shaped into perfect spheres exist around the world - but can they provide clues about humankind's past? (S16, ep 10)

They keep coming back. There are areas around the world that seem to keep attracting UFOs, where objects return to the skies again and again, as if taunting witnesses below. (S1, ep 7)

Warwick: Dan explores the turbulent history that took place within the well-preserved walls of Warwick Castle, touching on tales of betrayal, bloodshed, murder and financial woe. (S1, ep 3)

Stretton, Staffordshire: In Stretton, Hugh and the team search for prehistoric roundhouses and try to work out when people first made the Staffordshire village their home. (S2, ep 2)

Cover-Ups: What's going on in Area 51? What crashed at Roswell? And what's happening at the top-secret Dugway Proving Ground? Experts go in search of answers. (S1, ep 2)

The Devil's Swamp: The King of the Swamp investigates disturbing phenomena in a malevolent section of a swamp home to strange creatures. (S2, ep 3)

A strange structure shaped like a giant shark might point the way to a lost civilisation's Fountain of Youth. (S4, ep 20)

Syria: Since the Syrian civil war broke out in 2011, 400,000 have been killed in the conflict. Who is to blame for this and the terrible conditions in which its people live? (S2, ep 2)

Mighty Wooden Warships: We learn about life on a Tudor ship from objects found on the Mary Rose, while on HMS Victory we learn the battle-winning tactics of Admiral Nelson. (S1, ep 9)

Russian Intervention in Georgia: In 2008, nearly 850 people are killed in the Russo-Georgian War. How did it erupt and what is the current relationship between the two nations? (S2, ep 3)

The Killing of Margo Compton: When Hells Angels are linked to the murder of a woman and her daughters, a detective embarks on an 18-year quest to bring the killers to justice. (S1, ep 3)

The UFO Superhighway: With so many strange reports of UFOs, animal mutilations and more, a specific latitude north of the Earth's equator has been dubbed 'the UFO Superhighway'. (S16, ep 8)