Step inside the world’s most extraordinary private libraries, where rare books, priceless manuscripts and spectacular architecture create collections worth more than mansions.

Hidden on Cap Martin near Monaco, Villa Cypris is a remarkable 1904 estate where Byzantine architecture, Mediterranean gardens and Riviera history meet.

Step inside Chestnut Hall, Atlanta's iconic $46.8 million English Tudor estate, where timeless European architecture, museum-worthy interiors and 18 acres of breathtaking private grounds redefine luxury living.

Hidden in England's picturesque Cotswolds, this $70 million manor combines timeless architecture, luxurious interiors, and breathtaking countryside to create one of Britain's most extraordinary private estates.

Step inside Israel's most expensive mansion, a $259 million palace featuring grand architecture, lavish interiors, resort-style amenities, and extraordinary luxury.

Listed at $115 million, The Oaks Estate on Lake Thonotosassa is Florida's most extraordinary private residence 87 acres, 36,000 square feet of French Normandy architecture, a private racetrack, a 20-car collector garage, and a world so vast it takes 3.5 hours to tour. This is what trophy real estate looks like when ambition has no ceiling.

Hidden above Èze between Nice and Monaco, Château Balsan also known as Lou Seuil remains one of the French Riviera’s most mysterious historic estates. Once linked to Consuelo Vanderbilt, the secluded property continues to fascinate Riviera history and architecture enthusiasts.