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.
On June 6, 1944, D-Day, 1.5 million Allied troops take part in the greatest invasion in history, but then bog down in the Norman hedgerows for weeks. Saipan proves the costliest Pacific battle to date, while back home dreaded telegrams from the War Department begin arriving at an inconceivable rate.
A look at how Hitler calculated that to fight on long enough to fulfil his aim of eradicating Europe's Jews he needed to capture the Caucasus, and to do that he had to take Stalingrad. There is also a look at how the US rebuilt its navy and took itself from the 18th-ranked army in the world to be second only to the Soviet Union, a tale of ingenuity and enterprise that turned the vast resources of America into the numbers that could win a war.
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.