Expensive Mansion, Nevada, United States

The "modern" mansion
Mansions built during the last and present 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 theatre. 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 office, while at the beginning of the 21st century the presence of a room designed for a home theatre or cinema is a must. Most recently, mansions have been built with integrated domotics.
A modern mansion today may not necessarily be limited to a single house standing alone. Compounds, or a grouping of larger houses have become more popular. The Kennedy Compound is an example of one family building surrounded by large houses on a single plot.