Sky History 2 Friday

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

In North Somerset, archaeologists are blown away by the discovery of an entirely new Roman town in the intended pathway of some new electricity cables

Documentary exploring how ancient civilisations created weapons of mass destruction that are even more deadly than those created today

A selection of recently declassified FBI files provides new evidence for the debate over whether alien life really exists, and theorists claim the Vatican may be hiding the truth

Journalist Tony Harris and his panel of experts investigate UFO hotspots around the globe and pass a verdict.

Experts question what probes on Mars may have found over the past 40 years, asking if Nasa could be hiding proof of life on the Red Planet from the public