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.
Bettany Hughes' series exploring the lives and teachings of influential ancient philosophers draws to a close with a profile of Confucius, who is credited as the first Chinese thinker to take a systematic philosophical approach to issues of social, political and ethical importance. Born during the chaotic Spring and Autumn period of Chinese history, Confucius believed that harmony could be promoted and achieved through the examples of sage rulers. He was also a innovative teacher, and tried to instill his principles of moral excellence in China's elite, but died without seeing his vision for his nation come to pass. However, his philosophies would eventually form the bedrock of Chinese culture, with many of his principles of tradition surviving to this day.
In the final part of the series Bettany Hughes recalls the time that marked Rome's symbolic break with its 1,000-year pagan past - the day in 337AD that Emperor Constantine the Great was baptised a Christian. It was a moment of profound significance not just for the empire, but for the history of the world and one of its major religions. Constantine was one of the last great Roman emperors to rule over a united empire, giving it a new capital - Constantinople, today known as Istanbul - a city which would one day eclipse Rome as the greatest city on Earth.
From the 15th to well into the 20th century, Europeans conquered and dominated the world. On behalf of Spain, Christopher Columbus sought a new sea route to India and instead found a "New World". His discovery was the starting signal for the "Europeanization of the Earth".