The most expensive painting in the world by valuation is the Mona Lisa by Leonardo da Vinci, valued at about $1 billion. It has never been sold and is securely held in the Louvre Museum in Paris, making its exact market price speculative but extremely high. The most expensive painting ever sold at auction is Salvator Mundi, also by Leonardo da Vinci, which was sold for $450.3 million in 2017. This painting is notable for being the highest-priced artwork ever sold publicly. Other top expensive paintings sold include "Interchange" by Willem de Kooning at $300 million and "The Card Players" by Paul Cézanne at $250 million.