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In Madagascar, paleontologists discover an near-perfect fossil unlike any known animal, and bizarre stone spheres are found in Costa Rica.

A giant chasm opens in Siberia, dubbed a gateway to the underworld. Meanwhile, an entire island mysteriously vanishes without a trace.

Theories surrounding the death of Hermann, who managed to cheat the hangman by taking a cyanide capsule and his relationship with Lt. Colonel Douglas M Kelley.

The theories, conspiracies and facts relating to Rudolf Hess's dramatic flight to Scotland in 1941 and his subsequent death in Spandau prison.

Explore key hints that aliens may have assisted ancient civilisations, from building megastructures to sharing key information.

A look at how ancient man could have built huge stone monoliths without advanced tools or technology. Could they have had extra-terrestrial help.

Dr Alice Roberts joins a team of archaeologists as they attempt to restage a Roman cavalry tournament.

Alice Roberts follows archaeologists as they excavate Iron Age Britain's most spectacular grave - a Yorkshire chariot burial. (4 of.

After being foundered in a storm, Oceanos was abandoned by many of her crew - including the negligent captain - leaving hundreds of passengers stranded on board.

In Madagascar, paleontologists discover an near-perfect fossil unlike any known animal, and bizarre stone spheres are found in Costa Rica.

A giant chasm opens in Siberia, dubbed a gateway to the underworld. Meanwhile, an entire island mysteriously vanishes without a trace.

Theories surrounding the death of Hermann, who managed to cheat the hangman by taking a cyanide capsule and his relationship with Lt. Colonel Douglas M Kelley.

The theories, conspiracies and facts relating to Rudolf Hess's dramatic flight to Scotland in 1941 and his subsequent death in Spandau prison.

Discover the untold saga of the world's greatest military fighting force, made up of 150 pairs of male lovers, whose story has just been uncovered.

Explore key hints that aliens may have assisted ancient civilisations, from building megastructures to sharing key information.