The Ark of the Covenant, a golden chest built to hold the Ten Commandments, is one of the most important religious artifacts in the world. But over 2,500 years ago, the Ark disappeared. Ever since, legends, theories and Hollywood blockbusters have tried to explain what happened to it. Was it destroyed or captured? Or could it still exist? Olly explores the plausibility of one of the most exciting theories in the premiere episode.

Carved into the Peruvian desert thousands of years ago, the Nazca Lines have puzzled archaeologists and laypeople alike ever since their discovery 100 years ago. Olly travels to ancient cemeteries and Nazcan cities that are curiously off-limits to camera crews. He explores underground tunnels used in psychedelic cult initiations and tries to venture into the spirit world himself to unravel the mystery of the Nazca Lines.

From the golden churches of the Incan capital Cusco, Olly follows the trail of El Dorado along a road of ruins deep into the remote Andes Mountains, leading an expedition that promises to open a new chapter in the centuries-old hunt for the City of Gold and change the face of archaeology.

Perhaps the most famous lost city of the ancient world, Atlantis is an enduring symbol of mystery and beauty. Beginning with Plato, people have dedicated their lives to finding the missing continent. But what happened to Atlantis? Through dogged reporting, Olly reveals new evidence that could explain the mystery of what really happened to the fabled city of Atlantis.

For more than 200 years, the infamous Amber Room, made entirely from carved amber, gems and gold, were the pride of the Russian czars - that is, before the Nazis looted the treasure in 1941. In this episode, Olly uncovers exciting new evidence that could lead once and for all to the discovery of the Amber Room.

Olly discovers some lost, ancient mummies from different cultures that were recently re-found in a German museum and unravels how they were used by Hitler's Secret Service for the Nazi's ultimate propaganda mission.

Long before Alcatraz, there was Devil's Island - the most notorious and vicious prison complex ever constructed. Escape was said to be impossible. But was it? Olly explores the horrors of prison life and tests first-hand whether tales of great escapes could be true.

Olly sets out on his first journey to unravel the mystery surrounding Robin Hood - one of literature's most enduring characters who might just be based on historical fact. The Hollywood Robin may be portrayed as a romantic bandit wearing green tights, but in truth Robin would have been a violent man living in violent times. In this investigation, globe-trotting Olly heads back to his homeland, England, to explore the legends of Robin Hood by living them himself. Olly tries his hand at the long bow, tracks down the REAL Sheriff of Nottingham, practices survival techniques in Sherwood Forest, sets up an ambush, looks for traces of a real Maid Marian, and lives like the famous bandit to truly understand what it meant to be an outlaw in medieval England. Also includes deleted scenes.