Most valuable object stolen

Most valuable object stolen
Who
Mona Lisa
Where
France (Paris,)
When
12 August 1912
Although Leonardo da Vinci’s Mona Lisa, has never been valued, it is arguably the most valuable object ever stolen. It disappeared from the Louvre, Paris, France on 21 August 1911. It was recovered in Italy in 1913, when Vincenzo Peruggia (Italy) was charged with its theft.

Valuable artworks still to be recovered as of September 2004 are:

Jan Vermeer's The Concert taken from the Isabella Stewart Gardner Museum, Boston, USA on 18 March 1990 and estimated to be worth US$80 million.

Edvard Munch's The Scream  taken from The Munch Museum, Oslo, Norway on 22 August 2004 and estimated to be worth US$75 million.