You know the Mona Lisa, but do you know WHY you know the Mona Lisa?
"Vincenzo Peruggia (8 October 1881 – 8 October 1925) was an Italian museum worker, artist, and thief, most famous for stealing the Mona Lisa from the Louvre museum in Paris on 21 August 1911."
More on Wikipedia:
https://en.wikipedia.org/wiki/Vincenzo_Peruggia