Horizon: The Mystery of Dark Energy

The 'mighty' Hood was the pride of the British Navy for more than 20 years, revered around the world as the largest and most powerful warship afloat. But when it was sunk by the German battleship Bismarck off the coast of Greenland on 24 May 1941, its end was shockingly swift.

The story of the Great War told from a unique new aerial perspective. Featuring two remarkable historical finds, including a piece of archive footage filmed from an airship in summer 1919, capturing the trenches and battlefields in a way that has rarely been seen before. It also features aerial photographs taken by First World War pilots - developed for the first time in over ninety years - that show not only the devastation inflicted during the fighting, but also quirks and human stories visible only from above.

Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.

PBS' premier science series helps viewers of all ages explore the science behind the headlines. Along the way, NOVA demystifies science and technology, and highlights the people involved in scientific pursuits.

The story of the biggest seaborne invasion in history, told using a treasure trove of rare and previously unheard recordings of those who lived through it, lip-synched by actors.

Delves into the tragic case of teen mother, Nicola Payne, who at 18 years old went missing and was never heard from again. This limited series tells the extraordinary story through gripping first-hand testimony from Nicola’s heartbroken family, alongside witnesses and the lead police detectives who carried out the investigation - still one of Britain’s largest unsolved murder cases. The series examines all the evidence, highlights key failings in the original work of the police and uncovers shocking new revelations.

A group of young, risk-embracing day traders used social media to organize a massive stock buy-up. Jordan Belfort provides details about the story, exploring how it shook the world's markets.

The real Great Escape didn't feature Steve McQueen racing through the Third Reich on a motorcycle like in the 1963 movie, but the big breakout was still thrilling in every way. This program sheds new light on the audacious escape of 76 Allied airmen from a Nazi POW camp during World War II.

Amid rumours of an engagement between Prince Harry and Meghan Markle, this documentary charts the history of their romance and focuses on the woman whom the prince wants to marry.

Documentary looking at the work of the U.S. government department the Advanced Aerospace Threat Identification Program, which investigates sightings of unidentified aerial phenomena.

The ten greatest spy movies as analyzed and voted for by the real life spies themselves.

Unlock the secrets of the most celebrated and prized gem in the world. Learn why the Hope Diamond has inspired superstition and passion since its discovery centuries ago, and see how its unique qualities and mythic past have categorized the jewel as both a scientific marvel and a historical enigma.

Georgi Markov's death by poisoned umbrella in 1978 remains unsolved, but it is thought the Bulgarian dissident writer was silenced by the KGB.