Sky History 2 Sunday

Experts examine strange stone structures on New England and New York's landscapes, contemplating whether they offer clues of alien visitors to Earth

Serpent gods are found in many religious texts, but could these stories be describing reptile-like extraterrestrials, and are they still here today?

An assessment of whether past plagues have been brought to Earth by aliens and whether the planet is prepared for an extraterrestrial invasion of disease

Professor Alice Roberts explores the medieval history of Lincoln, visiting the cathedral that was once the world's tallest building

Alice Roberts explores London's Restoration history, including the founding of the Royal Society and the violent dark side behind Charles II's carefully crafted public image

A walk through India's Taj Mahal, the iconic mausoleum complex commissioned in 1632 by the Mughal emperor Shah Jahan to house the remains of his beloved wife

One of the world's most infamous deep-sea mysteries remains unresolved. As evidence continues to mount, the mystery of the Loch Ness Monster endures

Archaeologists in Russia find several mass graves, a Second World War plane sits on a Canadian mountain and cosmic rays in Antarctica have experts stumped

Helen Skelton and Alex Langlands head to a Cheshire dig where archaeologists have dug up human skeletons that reveal secrets about life during the Black Death

Helen Skelton and Alex Langlands investigate the Pendle Witch trials of 1612, visiting Lancaster Castle, where the suspects were held

Helen Skelton and Alex Langlands visit Sherwood Forest to learn more about the legend of Robin Hood - who may or may not have been real - and King John, who definitely was

The origin of genius, considered to be the ability to change the world in an incredible way

How new technology is allowing people to be able to explore oceans and deep lakes more than ever before

Part two of two. Adam, Gwen and Julie recall personal encounters with UFOs, before it is revealed that each individual has time missing from their plotted recollections

Tony Harris travels to the Florida coast to investigate strange weather patterns and unexplained phenomena at the Bermuda Triangle

Experts investigate whether Betty and Barney Hill really were abducted by aliens. They also explore the mystery of The Mothman, and Travis Walton's disappearance

Fritz Todt was the man tasked with the Nazis' engineering projects, including the autobahn and the West Wall defences. He died, mysteriously, in 1942

An indigenous woman's testimony claims to know where Slumach found his gold. After returning from the expedition empty-handed, a vision has Kru rattled

Amanda Holden and Dan Jones focus on sexual behaviour in the 20th century, with Amanda learning how sex changed for women with the introduction of the birth control pill

In numerous ancient cultures, stories were told of ancestors from the Pleiades star cluster. This programme considers whether new scientific findings may reveal the truth

UFO witnesses have reported a variety of objects in Earth's skies for centuries, but whether they offer clues about more intelligent life in the Galaxy remains unclear

An examination of objects found on the Mary Rose and the battle-winning tactics of Admiral Nelson on HMS Victory

A look at the tactics employed to pass strategically important ships under the nose of the enemy, and the use of intelligence to carry out naval attacks

According to the earliest Tibetan traditions, hidden in the Himalayas is Shambhala, a kingdom of the gods. This programme assesses whether such a mystical realm might truly exist