17. Lonsdaleite Estate – $185 Million
The Lonsdaleite Estate is in the Engadin valley near St. Moritz in Switzerland. This 7-story home was built in the side of a mountain featuring unique elegant elements that make this house unique. A 24-karat gold leaf accent wall, a $145,000 custom-egg shaped chandelier, a crushed red-velvet library wall, white Scandinavian fox-fur rug in the master suite with a white-onyx master bath is just a few of the amazing pieces of the home. It also features an underground lake, a wine cellar, a cinema, a spa featuring a Himalayan salt room, and sauna, a ski den with a private chairlift, and a 6 car garage.