The Louvre Museum opened in 1793 and the Mona Lisa was only put on display there in 1804.
http://www.smithsonianmag.com/arts-...ame-the-worlds-most-famous-painting-16406234/
https://www.youtube.com/watch?v=EQr4FhbcPMg
Just so you know, the Baedeker guide, even if it was two sentences, said it was "the most celebrated work of Leonardo in the Louvre". It was known to be a masterpiece by there intellectuals of the time and it was placed into the museum first in 1798, but was taken by Napoleon and put in his bedroom until 1804
https://mobile.nytimes.com/2005/04/06/arts/design/in-louvre-new-room-with-view-of-mona-lisa.html
Leonardo apparently carried the painting with him, first to Milan, then to Rome and finally to France, where he died in 1519. King Francis I acquired the portrait from one of the painter's heirs. It was hung in royal palaces in Fontainebleau, the Louvre and Versailles until it was placed in the new Museum Central des Arts in the Louvre in 1798. In 1800, Napoleon took it to his quarters in the Tuileries Palace, but it returned to the museum in 1804.