Sky History 2 Monday

The ancient site of Gobekli Tepe, which hallenges what archaeologists believe about the past

Researchers claim hidden messages can be found within the works of Leonardo da Vinci and other artists that may reveal an extraterrestrial influence

The connection between the development of military devices and the aftermath of their usage - dynamics that shaped several millennia of human fate

Key events of the Second World War, beginning with Germany invading Poland, and touching on Japan's expansion in Asia

The criminal gangs across the world using highly encrypted phones to stay under the radar

The ancient site of Gobekli Tepe, which hallenges what archaeologists believe about the past

Researchers claim hidden messages can be found within the works of Leonardo da Vinci and other artists that may reveal an extraterrestrial influence

Alice Roberts visits Norfolk to explore an Iron Age hillfort, discovering that 4th-century Romans used it the most, before travelling to a community dig in Lincolnshire

Uncovering archaeological treasures in the south of England, including Britain's oldest shoe, Henry V's lost shipyard and top-secret Second World War defences

Alice Roberts explores treasures in the west of Britain, including the remains of Snodhill Castle in Herefordshire and the oldest house ever found in Cardiff

Alice Roberts visits archaeological digs in Buckinghamshire, Somerset, Dorset and Northumberland, finding out about discoveries that shed new light on British history

Alice Roberts visits Happisburgh in Norfolk, where rare artefacts challenge the belief that the earliest human beings would not have been able to survive in northern Europe

Tony Harris and his team of experts probe reports of a serpent-like creature caught on camera. Plus, possible signs the Nazis colonised the South Pole

Key events of the Second World War, beginning with Germany invading Poland, and touching on Japan's expansion in Asia

How, in the absence of humanity, the world's most iconic cities - from New York, to Orlando, to Rio de Janeiro - would be reclaimed by nature, as forests rise

An examination of several seemingly impossible things 'caught on film', including claimsa trucker captured a legendary Native American creature on his dashcam

Footage of more real-life events. A construction worker is caught out on the ledge of a burning building, while two kayakers are swallowed alive by a humpback whale

The ancient site of Gobekli Tepe, which hallenges what archaeologists believe about the past

Researchers claim hidden messages can be found within the works of Leonardo da Vinci and other artists that may reveal an extraterrestrial influence

The team uses high-tech sidescan sonar and deep sea magnetometers to search for evidence after learning of an encounter with an underwater phenomenon

The team finds evidence from one of Scotland's bloodiest eras as they wade through the waters of the River Garry in the stunning Scottish Highlands

Alice Roberts visits Norfolk to explore an Iron Age hillfort, discovering that 4th-century Romans used it the most, before travelling to a community dig in Lincolnshire

A grim discovery in a Swedish lake reveals shocking ancient practices and the fossil of a previously unknown mammal is found in the Canadian Arctic

On the hunt for classic old Canadian canoes, Scott and Sheldon find themselves up the creek without a paddle. Later, they're forced to haggle with a smart teen

Extended episode exploring suggestions of extraterrestrial influence on Earth. Subjects include actions initiated by the US Department of Defence to study UFO sightings