$53 Million Underground Mansion in California
housebeautiful.comThe eight-acre estate in Rolling Hills, CA, on the Palos Verdes Peninsula, has nine bedrooms, 25 bathrooms, a 10,000-square-foot Hamam (Moorish-style spa and baths), a 15,000-square-foot Neoclassical grand ballroom, and indoor and outdoor swimming pools and tennis courts (the latter of which Pete Sampras has visited).
But aside from the amenities, what really makes this property unique is that to comply with the surrounding equestrian community's single-story building rule, it's built down five stories into the ground. Secret passageways connect the underground rooms, and the entire project was overseen by Rafael Manzano Martos, a curator for King Juan Carlos of Spain.
