While market transactions assign immense numerical values to works like Leonardo da Vinci's Salvator Mundi, art historians and cultural institutions generally consider Leonardo da Vinci's Mona Lisa, housed in the Musée du Louvre in Paris, to be the most priceless painting in the world. The Mona Lisa is legally uninsurable due to its immeasurable cultural, historical, and artistic significance, rendering any theoretical market valuation irrelevant since the French state will never permit it to be sold. Its iconic status, revolutionary sfumato technique, global cultural footprint, and universal recognition make it an irreplaceable masterpiece that transcends standard financial metrics and commercial art market pricing altogether.