25 largest houses in america
The word itself derives from the Latin word mansio dwelling, an abstract noun derived from the verb manere to dwell. The English word manse originally defined a property large enough for the parish priest to maintain himself, but a mansion is no longer self-sustaining in this way . Manor comes from the same root—territorial holdings granted to a lord who would remain there—hence it is easy to see how the word Mansion came to have its meaning.
Mansions built during the 20th and 21st centuries usually have specially designed rooms meant to accommodate leisure activities of a particular kind. Many will have a conservatory or greenhouse, while others will have an infinity pool or a home theater. Some have all of these features. The relative importance of these specially designed rooms changes with the times: At the beginning of the 20th century no true mansion would have been built without a room to house a private library or study, while at the beginning of the 21st century the presence of a room designed for a home theater or cinema is normal. Most recently, mansions have been built with integrated domotics. Some other technology-inclined mansions may even have a bowling alley or a server room. (source : wikipedia