The title of the richest house in Monaco is undoubtedly held by Villa La Vigie. This luxurious residence, perched on a hill, offers breathtaking views of the Mediterranean Sea. Formerly owned by fashion icon Karl Lagerfeld, this opulent mansion spans over 13,000 square feet, boasting seven bedrooms, a swimming pool, and verdant gardens. With its world-class amenities and prime location, Villa La Vigie represents the epitome of lavish living in the principality.