Leonardo da Vinci's Lost Art - Apparently.
Leonardo da Vinci was known to have created a painting of a woman known as the "Monna Lisa" or "La Gioconda," but what is less well-known is that he also created a painting called "Salvator Mundi," which sold at auction in 2017 for a record $450.3 million. However, what's remarkable is that there were not one but two versions of "Salvator Mundi" created by da Vinci, with the other one being lost to time. This second version is now believed to be housed in a private collection in Russia.
(Verifiable sources: Christie's auction house, The Art Newspaper, and Smithsonian Magazine)