It varies over time. For a long time, it was the Second World War and the Holocaust. How do you get the rise of Nazis and the horrors that sprang therefrom? Sadly, I think that question has been answered to my — for lack of a better word— satisfaction.

The execution of Socrates has spurred a great deal of thought.

In terms of what is not so much a historical event, but historical processes, I’m intrigued by the life of Buddha.

Then there are a lot of explorer / adventurer travels.