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The Sentinels: Seven stone giants stand guard over a Pacific island. But what are they protecting? And from whom? (S11, ep 9)

Crash and Retrieval: The team head to Mexico to the site of an alleged international incident involving the remains of a UFO wreck. (S1, ep 6)

The Colchester Siege: The River Hunters hit the oldest town in Britain, searching the town's historic waterway for evidence of the Siege of Colchester. (S2, ep 5)

Romans: Silchester is one of the best preserved Roman sites in Britain. Why did Rome's infamous emperor Nero stamp his mark on the town? (S2, ep 2)

Iceland's Glacier Tomb: In Russia, 34,000-year-old graves are discovered. Meanwhile, a team attempts to locate a British World War II aeroplane that went missing in Iceland. (S3, ep 5)

Big Hairy Deal: On the lookout for Big Foot, the Pickers search Southern B.C. for treasures like vintage toys, a silver saddle and cedar canoes. (S2, 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)

In 1943, Germany fell at Stalingrad, its first major defeat. In the Pacific, Japan lost momentum after the US won at Guadalcanal. (S1, ep 3)

The Japanese Super Code: The Japanese Super Code reveals the US efforts to crack Japan's unbreakable WWII code following the horror of the attack on Pearl Harbor. (S1, ep 3)

Stalemate: With the Allies at crisis point, pressure mounts on the Wrens to prove their worth and the stage is set for a battle that will turn the tide of the Atlantic war. (S1, ep 5)

A Roman Mystery And Waterloo's Disappearing Dead: Roberts uncovers East of England's top finds, including a Roman dodecahedron, Boudicca's fort and Waterloo's lost dead. (S11, ep 4)

3000-Year-Old Shoes and Giant Axeheads: Discoveries in southern England reveal Britain's oldest shoe, a forgotten warrior king's shipyard and hidden World War II defences. (S11, ep 5)

Forgotten Fortresses And Lost Villages: Digs in western Britain uncover a forgotten fortress and a shocking discovery hidden beneath a Roman mosaic. (S11, ep 6)

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)

Torpedo Boats At War: From tests in the River Thames, to the German's deadly U-boat attacks in World War II, this episode explores the silent threat of submarines. (S1, ep 5)

Precious Cargo: The astonishing accounts of four railway journeys that changed history, including the perilous expedition that made a young Winston Churchill world famous. (S1, ep 5)

Spy Game: Exploring the machines that hide in the shadows, capturing, transmitting and analysing vital combat information. (S1, ep 5)

Timur's Tomb: A neglected warning inside a mighty conqueror's tomb heeds one of the deadliest invasions in human history. (S1, ep 3)

Barnum Museum: The world's greatest showman, a rumoured valley of gold and a fortress of protection - their legends prove fame, wealth and even safety can come at a dire cost. (S1, ep 4)

Hidden Treasures: Explore some of the most valuable treasures found in the most unlikely of ways. (S1, ep 2)

...Mysteries of the Universe. Alien Earthlings: As we plan to travel to new worlds, how are we preparing to become human extraterrestrials? Will we survive into the unknown? (S1, ep 2)

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)