2. Located in the ritzy Holmby Hills neighborhood of Los Angeles, the home was built on speculation on the same lot where Barbara Streisand's "Mon Rêve" estate once stood. The new structure covers a whopping 38,000 square feet and has 10 bedrooms and 20 full baths.
Price: $150 million
Additional amenities include private hiking trails and a movie-theater complex with its own guest valet entrance.