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The Top Ten UFO Crashes: An acorn-shaped crash, a craft in Japan and a baffling impact in Britain - could these strange events prove Earth has been visited? (S17, ep 4)

Top ten Unexplained Technology: Explore 10 astonishing, unexplained technologies: from golden orbs in Mexico to a sacred box said to speak with the heavens. (S17, ep 5)

Experts investigate why so many UFO sightings take place in Los Angeles, determining that the answer may lie underwater. (S1, ep 3)

York: Dan explores the history of York's castle, from the Viking Jorvik and the Normans, to the dark days of the anti-Jewish pogrom and the imprisonment of the Knights Templar. (3 of 5)

Oswestry, Shropshire: Hugh and the team go on the hunt for the Morda Workhouse in Oswestry, to find out what the conditions were really like for those who lived there. (S3, ep 3)

Paranormal Destinations: Experts investigate the US government's experiments into teleportation. They also dig into strange happenings at Mount Shasta and Skinwalker ranch. (S1, ep 3)

Tikal: Discover Tikal, one of the largest and most powerful archaeological sites and urban centers of pre-Columbian Mayan civilisation. (S3, ep 3)

Hidden Treasure: The hunt is on for the Civil War Gold and for $1.5million taken in 1962's Plymouth Mail robbery. Plus, treasure seekers search for the Lost Dutchman mine. (S1, ep 9)

Heavy Metal: If people disappeared from Earth, what would happen to metallic objects? Would bridges and buildings collapse? And what would become of the US's secret stash of gold?

Explore a shipwreck found in the middle of the desert, learn about the German aerial terror of WW1 and traverse through a ghost town still stalked by a serial killer. (S5, ep 7)

Invasion of Panama: In 1989, 20,000 US troops entered Panama to overthrow military dictator Manuel Noriega and around 500 civilians were killed. What prompted the invasion? (S2, ep 9)

Galleon and Privateers: The 16th century witnessed a revolution in combat ship design and saw the birth of two legendary sea captains. (S2, ep 6)

The Top Ten Secret Projects: Secret agents, silenced UFO witnesses and hidden tech programs - could these mysterious projects prove contact with extraterrestrials? (S17, ep 3)

The Top Ten Mysterious Mountains: From Sri Lanka's mystical portal to Washington's volcanic encounter, these peaks spark questions about possible alien connections. (S17, ep 6)

Previously sealed documents hint at compelling new theories about extraterrestrials. Could aliens be living among us? And could former US Presidents know something we don't? (S1, ep 4)

Leeds: Dan Jones explores the 900-year history of the beautiful Leeds Castle in Kent, from its origins as a royal Saxon family's manor to a 20th-century retreat for the rich. (4 of 6)

Coventry: Hugh and the team search for a monastic grange known as Biggin Hall, which provided produce for the nearby monks at St Mary's Priory. (S3, ep 4)

Hidden Treasure: The hunt is on for the Civil War Gold and for $1.5million taken in 1962's Plymouth Mail robbery. Plus, treasure seekers search for the Lost Dutchman mine. (S1, ep 9)

Heavy Metal: If people disappeared from Earth, what would happen to metallic objects? Would bridges and buildings collapse? And what would become of the US's secret stash of gold?

Explore a shipwreck found in the middle of the desert, learn about the German aerial terror of WW1 and traverse through a ghost town still stalked by a serial killer. (S5, ep 7)

Invasion of Panama: In 1989, 20,000 US troops entered Panama to overthrow military dictator Manuel Noriega and around 500 civilians were killed. What prompted the invasion? (S2, ep 9)

Galleon and Privateers: The 16th century witnessed a revolution in combat ship design and saw the birth of two legendary sea captains. (S2, ep 6)

The Right Tools: Victory in war doesn't just require sound military strategy, vital resources and equipment are also critical. Discover how the Axis powers failed in this regard. (S1, ep 4)

The Great War - the Somme: Presenter Karl Ude-Martinez takes a tour of the weapons used during the Battle of the Somme in 1916, including machine guns and poison gas. (S1, ep 4)

The Top Ten Secret Projects: Secret agents, silenced UFO witnesses and hidden tech programs - could these mysterious projects prove contact with extraterrestrials? (S17, ep 3)