I find pre-roman briton to be a very interesting subject. Also the ancient ancient history of the area around china, koreas, japan. Migration in those areas is mad.

Anything to do with migration or the creation of new cultures and societies is interesting. That's also why I find ancient greece so interesting, because of the great conceptual development that we still can learn so much from today.

I'd have fled after the execution of Danton. But Robespierre fascinates me no end.

Ohh yes. I should have went into more detail instead of just mentioning L'arte dei Rumori. I got carried away with the design stuff.

20th century Europe in my opinion. The centerstage of two world wars (in which France and Britain stop their squabbling that had been going on for god knows how long in order to work together [an American point of view, if that's incorrect please forgive me]), reconstruction, the clashing of contrasting ideologies, revolutions right and left and the breakdown of the USSR to name a few interesting traits.

Civil War America, WWII Europe, Vietnam War.

I've always found the roman empire fascinating.
Especially everything before 1000 ad.