This genre is one of the largest non-fiction genres, and consists primarily of documentaries about one or more historical events or time periods. In general, the title will not be of a contemporary nature (that is, it will be made about a subject that actually occurred in the past, rather than being made at the same time an event is happening). Some historical subjects include war, ancient civilizations & archaeology, famous crimes, biographies of past leaders, politics, popular culture and trends of the past, and other major world events.