German commanders discover the efficiency of gassing prisoners, and Auschwitz transforms from a small backwater camp for those resisting the Nazi occupation of Poland to a large scale extermination camp for Jews.
Bettany Hughes explores the day in 80AD when the Colosseum opened its gates for the first time. For new emperor Titus, the spectacular games and events were an opportunity to win over the people and secure his place on the imperial throne, but why did the Romans - cultured and civilised in so many ways - enjoy witnessing such brutality and bloodletting? Bettany travels across the Roman world in a bid to find answers.
Mao Zedong, Supreme Leader of Communist China for 30 years, is one of the 20th Century's most ruthless tyrants. His reign of cruelty and revenge, transforms him to a position of authority so great, his personality cult remains to this day.
The story of the world's longest serving dictator, Muammar Gaddafi, and his 42 year reign of terror at home in Libya and around the world. His actions are so increasingly insane that President Reagan dubs him The Mad Dog of the Middle East
See how Osama bin Laden's journey unfolds; from his roots as a privileged young Saudi boy to becoming the formidable leader of al-Qaeda, and his lifetime commitment to violent jihad against the West, which results in the horrific attacks in 2001.
In Episode Four Watch Manuel Noriega rise through the Panamanian military to become chief of intelligence and then, military dictator. He spied for the United States, but in the end, money laundering, drug trafficking and political crimes led to his downfall.