A 650-pound door with 12 bolts. A gassing system in the ceiling. AI cameras that learn your property's normal patterns. And a $175,000 protection dog trained by former special forces.

A Duchamp pocket set. A tsar's gaming table. Three jewelled masterpieces that only three people in the world own. The chess sets that billionaires collect — and why they pay millions for them.

Once owned by King Leopold II of Belgium and later by some of the world's wealthiest individuals, Villa Leopolda sits hidden above the French Riviera as the most expensive private estate ever valued on the Côte d'Azur.

Discover the extraordinary world of luxury crystal, where centuries-old craftsmanship transforms glass into collectible works of art. From Baccarat and Saint-Louis to Lalique, explore the rare pieces, spectacular table settings and crystal creations worth more than a luxury car.

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.

Discover the three most expensive restaurant dishes in the world, from a $25,000 gourmet taco to a $12,000 private pizza experience. Explore the extraordinary ingredients, exclusive restaurants, and remarkable stories behind these unforgettable luxury dining creations.

Discover three extraordinary airport lounges that transform the travel experience through world-class architecture, fine dining, personalised service and timeless luxury.

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.

It has a concert hall with a baby grand piano, a Turkish bath with gold-plated fittings, a prayer room whose mats rotate automatically to face Mecca, a built-in garage for a diamond-encrusted Rolls-Royce, and a stable for horses and camels.