Isleworth Mona Lisa
According to Leonardo's early biographer Giorgio Vasari, Leonardo had started to paint "Mona Lisa" in 1503, but "left it unfinished". However, a fully finished painting of a "certain Florentine lady" surfaced again in 1517, shortly before Leonardo's death and in his private possession. The latter painting almost certainly is the one that now hangs in the Louvre. Based on this contradiction, supporters of the authenticity of the "Isleworth Mona Lisa" claim it is the unfinished "Mona Lisa", made at least partially by Leonardo, and the Louvre "Mona Lisa" a later version of it, made by Leonardo for his own use.
Roberto Vittori
The astronaut also had a painting of the artist George Pusenkoff titled "Single Mona Lisa (1:1)" with him and took photos with it on the International Space Station. It is the ultimate continuation of the project "Mona Lisa Travels" developed by Pusenkoff and could only be realized under difficult conditions. The authorities found the idea good in theory, but constantly put forward new reasons why the project was unrealizable. Only when George Pusenkoff wrote to the then Italian ambassador in Russia, Gianfranco Facco Bonetti, the possibility of realizing the idea arose. The connection between science and art, which was also important in Leonardo da Vinci's life, found here an "actualization" in the form of this journey of an image of Mona Lisa into space. For the action, Pusenkoff's painting was removed from the frame so that it could be rolled. On April 25, 2005, Vittori took the painting back to the Earth with him.