Check out Napa Valley's most expensive home, a $25m estate located in Deer Park at 850 Sanitarium Road. "The warm modern design features an open floor plan connecting living, dining, cooking, and family rooms, a 2,000 bottle wine library, luxurious primary suite, massage room, gym, two offices, media/theatre room, infinity edge pool, outdoor kitchen, and a full two-suite guest apartment with its own living room and view deck."