Leonardo da Vinci “The Mona Lisa” / various

(Along with several successful thefts, the painting has been attacked by vandals on numerous occasions:

a) In 1956, the lower part of the painting was severely damaged when a man doused the painting with acid.

b) Also in 1956, a man threw a rock at the painting, damaging the canvas near ML’s left elbow.

c) In 1974, a handicapped woman, upset by the museum’s policy for the disabled, sprayed red paint at the work while it was on display at the Tokyo National Museum. The painting, behind glass, was unharmed. 

d) In 2009, a Russian woman, distraught over being denied French citizenship, threw a terra cotta mug (purchased at the Louvre gift shop) at the painting. The mug shattered against the glass enclosure, leaving the painting unharmed. )