How much is the Virgin of the Rocks painting worth?

Leonardo da vinci painted two versions of this subject, one of the paintings is in the National Gallery in London, the other is in the Louvre, Paris. As for value, that can only be determined if the painting were to come up for auction. There are many factors that determine the value a piece of art, and the market fluctuates. Appraisals also come in many forms such as current market value and replacement value.