Sky History 2 Tuesday

The SS Rex, an Italian ocean liner launched in 1931. She held the westbound Blue Riband between 1933 and 1935 and later saw action in the Second World War

A Swiss fisherman uncovers ancient Celtic relics in Lake Neuchâtel, hinting at a violent Iron Age battle that happened around 225BCE

An amateur archaeologist encounters strange symbols scratched into the Kazakhstan Desert. Plus, a lake in the Brazilian rain forest turns bright pink

As the Third Reich rose to power, Himmler and the SS became fixated on the Holy Grail, interpreting much of the myth surrounding it as fact - and the quest for it as attainable

How Himmler's belief in the theory that the Himalayas were home to the Nazis' Aryan ancestors led to an SS mission to the mountains

Experts scrutinise the paintings, journals and technical drawings of Leonardo Da Vinci to establish whether they hide evidence of extra-terrestrial beings

Investigations into the possibility that sightings of alien beings or UFOs may actually be evidence of time travellers from the future

A focus on the widespread belief in astrology, the spread of astronomical knowledge and how the revolutionary ideas of Ptolemy, Copernicus and Galileo reshape our ancient skies

Archaeological finds across the North of Britain, including clues to Scotland's first kingdoms and a hoard of Viking treasure unearthed by metal detectorists

A visit to the Isle of Lewis in the Outer Hebrides, home of the 5,000-year-old standing stones of Callanish, traditional Scottish blackhouses and cut peat

The SS Rex, an Italian ocean liner launched in 1931. She held the westbound Blue Riband between 1933 and 1935 and later saw action in the Second World War

A Swiss fisherman uncovers ancient Celtic relics in Lake Neuchâtel, hinting at a violent Iron Age battle that happened around 225BCE

An amateur archaeologist encounters strange symbols scratched into the Kazakhstan Desert. Plus, a lake in the Brazilian rain forest turns bright pink

As the Third Reich rose to power, Himmler and the SS became fixated on the Holy Grail, interpreting much of the myth surrounding it as fact - and the quest for it as attainable

How Himmler's belief in the theory that the Himalayas were home to the Nazis' Aryan ancestors led to an SS mission to the mountains

Investigating real-life crimes in the age of film noir, beginning with triple homicide suspect Robert Irwin, who sold his story to finance his defence

The 1927 murder of Albert Snyder by his wife, Ruth Brown Snyder, and her lover, corset salesman Henry Judd Gray

Experts scrutinise the paintings, journals and technical drawings of Leonardo Da Vinci to establish whether they hide evidence of extra-terrestrial beings

Investigations into the possibility that sightings of alien beings or UFOs may actually be evidence of time travellers from the future

A focus on the widespread belief in astrology, the spread of astronomical knowledge and how the revolutionary ideas of Ptolemy, Copernicus and Galileo reshape our ancient skies

Archaeological finds across the North of Britain, including clues to Scotland's first kingdoms and a hoard of Viking treasure unearthed by metal detectorists

A visit to the Isle of Lewis in the Outer Hebrides, home of the 5,000-year-old standing stones of Callanish, traditional Scottish blackhouses and cut peat

Allen Haff and Ton Jones uncover a Marilyn Monroe statue, an industrial slip n' slide and a bed of nails at a live auction in Mission Hills, California

Allen Haff heads to an auction on his own where he finds LARP weaponry, a sword collection and falconry gear, while Ton Jones soups up their new truck

How speed has become a decisive feature in war's evolution - from the chariot that brought greater mobility to small handguns like Samuel Colt's revolver