Unpacking Mona Lisa at the end of World War II (1945) 

The Louvre’s most precious works of art were hidden in the French countryside, away from strategic locations to avoid being destroyed. There is a fantastic documentary about art during World War II called The Rape of Europa. It discusses how the Nazis stole and destroyed staggering amounts of art during the war as well as various country’s efforts to hide and recover the art. Highly recommend watching it.