Mata Hari, the archetype of the seductive female spy, is executed for espionage by a French firing squad at Vincennes outside of Paris.

In the Scottish islands of Orkney, the waters of Scapa Flow hide more than 150 wrecks – from German World War I battleships to a Spitfire. The eerie world is one divers can explore.

Ten historians from 10 countries give a brief history of the first world war through a global lens. Using original news reports, interactive maps and rarely seen footage, including extraordinary shots of troops crossing Mesopotamia on camels and Italians fighting high up in the Alps, the half hour film explores the war and its effect from many different perspectives. Watch the documentary in English, French, German, Italian, Spanish, Arabic or Hindi.