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From glyphs in the Peruvian desert to spiral petroglyphs embedded with advanced maths, explore some of the world's most intriguing symbols and codes.

Explore the most devastating disasters ever documented that may have an otherworldly connection, from a flying monster to a deadly virus.

UFO sightings are at an all time high. What makes these mass sightings incredible is also what makes them terrifying, and what might happen next.

Dan ventures behind the battlements of Dover Castle, exploring the underground lairs and a vast network of tunnels that have been used to defend the country for centuries.

Hugh and the team search for a Roman settlement under the back gardens of Florence Road in Maidstone, Kent.

Visit the fascinating Indian retreat where The Beatles meditated, explore a copycat Chinese city and check out a glass factory in Israel.

Dive into the Spanish conquest of Mexico in the 16th century, resulting in 400 years of overlooked history in Latin America.

Experts question ancient civilisations' fixation with the Orion constellation. Could this star group have been an entry point for aliens visiting Earth.

Experts question the startling similarities in burial tombs from distant cultures, asking if aliens could have influenced their complicated designs.

A chronological telling of the dramatic D-Day story, focusing on the vessels that made the landings possible.

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.

An elite force of Norwegian resistance fighters return to their invaded homeland to carry out a daring mission.

Hugh and the team attempt to uncover a Roman fort, connected to Hadrian's Wall, that's buried beneath the back gardens of Benwell in Newcastle.

Hugh and the team unearth William the Conqueror's lost priory hidden beneath Lenton in Nottingham.

Alice explores the stories of England's 'Golden Age', from Sir Francis Drake to the Spanish Armada, piracy, theft, and the slave trade.

Experts question ancient civilisations' fixation with the Orion constellation. Could this star group have been an entry point for aliens visiting Earth.

Experts question the startling similarities in burial tombs from distant cultures, asking if aliens could have influenced their complicated designs.

Science reveals new insights into belief and superstition in the land of the Pharaohs, from finding the long-lost 'Land of Punt' to Tutankhamun.

Discover how, for the past few thousand years, this mighty ruler has remained a caricature of his own propaganda.

Ex-Rolls Royce engineer Bradley Walsh questions the Pyramids' builders and purpose, seeking answers by visiting them himself.

Bradley journeys through Egypt to uncover the secrets of the Sphinx and explores the mysterious underground Serapeum.

Bradley travels to the tomb of Tutankhamun to unravel the mysteries of the rise and fall of Egypt's most famous royal dynasty.

Ross sees just how prevalent cocaine is in Colombia as he joins an army raid, before meeting the son of Gilberto Rodriguez - a founder of the Cali Cartel.

Hitler's plan for European domination led his new generation of tanks to the Soviet town of Kursk in July 1943. Witness extraordinary colourised footage of the battle.

Experts question ancient civilisations' fixation with the Orion constellation. Could this star group have been an entry point for aliens visiting Earth.