History is a more interesting subject for me, when dealing with source documents or things actually from the past. However, the modern stance of historical revisionism tends to push me away from historical documentaries. Historical movies, they're ok sometimes, but all have fiction added to make it supposedly more interesting or whatnot.
So, science fiction movies, because they make no truth claims where the facts have been compromised. Also, space battles are cool too.
Warp drive or hyperdrive?