Well actually they have a ton of guards, there are heat sensors around it, and it is in a hall with a system on all the paintings that if they are taken off the wall a trigger automaticly shuts off a gate to the exit. ( there is only one entrance to the hall.)
No it was not stolen.
Well The Mona Lisa has been stolen four times all by kings
It was stollen, but I don't know who.
22 August 1911
The Louvre
It was Mona Lisa and it was stolen by Vincenzo Peruggia
The Louvre Museum in 1911
When the Mona Lisa was stolen in 1911
Yes. See the related link below for the story.
Vencenzo Peruggia, a Louvre employee, stole the famous painting in 1911.
Yes, right after she was recovered (she was stolen) in 1913.
The Mona Lisa was stolen by Vincenzo Peruggia on 21 August 1911.