The most expensive (and effectively "priceless") piece in the Louvre Museum is Leonardo da Vinci's Mona Lisa (La Gioconda). While it is considered a French national treasure and cannot be sold, its estimated insurance and market value in 2026 is often cited as being over $870 million to $900 million. For comparison, the painting was insured for $100 million in 1962, which is approximately $900 million when adjusted for inflation today. Other multi-million dollar treasures in the museum include the Venus de Milo (estimated at $100M+), the Winged Victory of Samothrace ($120M+), and the Crown Jewels of France. However, the Louvre also houses artifacts like Hammurabi's Code, which holds no "market" value because it is an irreplaceable piece of human history. The Mona Lisa remains the primary driver of the museum's 9 million+ annual visitors, protected behind bulletproof glass in its own dedicated climate-controlled gallery, symbolizing the pinnacle of Renaissance art and global cultural heritage.