Tbh I don't have a favorite topic. Almost all history seems interesting. I could do the generic thing and say the World Wars but they have been so overplayed. I'd much rather learn about things I haven't even gotten into. Like this semester I am taking Modern Eastern Civilization. The only times the mention it otherwise is threw Marco Pallo, or when the European powers try and exert their sphere of influence on it and of course the modern history like the last 150 years.
I have interest in the Age of Exploration, Russian Revolution (especially after watching Dr. Zhivago), General Industrial Revolution and the increase in Urban Centers, Age of Colonialism, the American West(I took a class on it during my Senior year it seems interesting compared to the bland US History they teach that goes over the same material).