This documentary examines the case of Vincenzo Peruggia, an unassuming house painter charged with stealing the "Mona Lisa" from the Louvre in 1911. (Netflix summary)

It's the greatest little-known art theft of all time. With the most unlikely thief. And no one knows why he really did it. Until now. 100 years after the theft of the Mona Lisa, the award-winning documentary "Mona Lisa Is Missing" reveals the real reason Vincenzo Peruggia stole the Mona Lisa from the Louvre -- a reason Peruggia's only daughter didn't even know. And now ARCA members can own the DVD -- featuring 90 minutes of Bonus Features -- at a special discount price. Click on this link: http://bit.ly/MtZWpb and enter (or copy and paste) this special code at checkout: 3UJGLXNQYTJ8.

This is the photograph by Jean-Pierre-Muller Javier Sorrian/AFP/Getty Images of the Louvre's Mona Lisa  and the copy housed at Madrid's Prado Museum. guardian

With the recent discovery in Munich of €1bn (£860m) worth of art looted by the Nazis, and the forthcoming release of a feature film, starring George Clooney, based on the exploits of the Monuments Men, it is a fitting time to recall how fortunate we are that so much art survived thesecond world war. The Nazi art theft division, the ERR (Einsatzstab Reichsleiter Rosenberg), was responsible for the theft of around 5m works: from the Louvre, the Uffizi and countless churches, galleries and homes. From headline-grabbing works like Michelangelo's Bruges Madonna to the most frequently stolen artwork in history, Jan van Eyck's Adoration of the Mystic Lamb, both of which feature in the Clooney film, to lesser-known gems that nevertheless held a place in the hearts of museumgoers or families, the story of art looting during the second world war is a tree with countless roots. Each masterpiece has its own history, a provenance ripe with intrigue. Few of the individual stories have been told, fewer still in depth.

Among the many enduring mysteries of this periodis the fate of the world's most famous painting. It seems that Leonardo da Vinci's Mona Lisa was among the paintings found in the Altaussee salt mine in the Austrian alps, which was converted by the Nazis into their secret stolen-art warehouse. 

The painting only "seems" to have been found there because contradictory information has come down through history, and the Mona Lisa is not mentioned in any wartime document, Nazi or allied, as having been in the mine. Whether it may have been at Altaussee was a question only raised when scholars examined the postwar Special Operations Executive report on the activities of Austrian double agents working for the allies to secure the mine. This report states that the team "saved such priceless objects as the Louvre's Mona Lisa". A second document, from an Austrian museum near Altaussee dated 12 December 1945, states that "the Mona Lisa from Paris" was among "80 wagons of art and cultural objects from across Europe" taken into the mine.

Actually, Peruggia wasn't working at the Louvre when he stole the painting.  He had finished putting the artwork behind glass in January.  But Gobier, the company he worked for, continued to work there repairing the glass roof of the museum.  Peruggia had left Gobier in July during a strike and had gone to work with another company. I do think he stole it for the size, but also -- possibly --because it was a Leonardo. According to his testimony -- and the police didn't dispute it -- he entered that morning and didn't hide overnight.  No reason to.  Security was very lax.

Isleworth Mona Lisa (Wiki)

'La Joconde' (1503-1506) has mostly hung in the Louvre (INV. 779) since Francois I acquired it in 1518.  Last week The Mona Lisa Foundation reintroduced the 'Isleworth Mona Lisa' which had not been seen in public for more than 40 years and declared that it was an earlier unfinished portrait of Lisa Gherardini del Giocondo by da Vinci.

Jamie Keaton for the Associated Press (published online here in Business Week) reported on the unveiling of the Isleworth Mona Lisa in Geneva on September 28.  Keaton points out the Alessandro Vezzosi (see below) 'declined to line up behind the foundation's claim that it was truly a "Mona Lisa" predecessor painted by da Vinci.  Here, on the Museo Ideale Leonardo da Vinci's website, Professor Vezzosi clarifies that research on  the "Isleworth Mona Lisa" will continue.

The Mona Lisa Foundation, a non-profit organization based in Zurich, has on its website a 22-minute video that walks the viewer through its claim, using historical documentation (including writings of 16th century art historian Giorgio Vasari), connoisseurship, critical comparisons and physical and scientific examinations.  Participants in the video include Professor Alessandro Vezzosi, Director of the Museo Ideale Leonardo da Vinci; Professor John F. Asmus, Research Physicist at the University of California in San Diego; Stanley B. Feldman, and art historian and principal author of "Mona Lisa - Leonardo's Earlier Version".  The video asks if it is possible that there was another Mona Lisa and if so, what could have happened to it? It is claimed that Giorgio Vasari and Agostino Vespucci mention a painting left unfinished.  In the early 20th century, Hugh Blaker, curator of The Holburne Museum  in Bath, believed in the two Mona Lisa painting theory and spent a decade looking for the unfinished version until he found it "in the Somerset home of an English nobleman" "who's family had owned the painting for nearly 150 years."  Blaker brought it to his London studio in Isleworth, then shipped it to the United States where it hung in the private offices of the Boston Museum of Fine Arts, according to the video.  Then in 1922, Blaker sent the Isleworth Mona Lisa to Italy for the opinion of experts there.  In 1926, Baker's stepfather, John Eyre, published "The Two Mona Lisas."  Henry F. Pulitzer, over a period of 26 years, liquidated his Kensington estate and part of his art collection to purchase the Isleworth Mona Lisa.  In 1979, after Pulitzer's death, the painting was locked up in a Swiss Bank vault "where it would remain for more than four decades."  "Can science at least succeed where connoisseurship has failed [in establishing the painting's authenticity]?" In 2004, the Isleworth Mona Lisa was removed from its security vault and "entrusted to world renowned art auctioneer David Feldman" (Vice President of the Mona Lisa Foundation).  "Over the next 12 years, the painting went through every test" including examination by Professor Asmus who has also examined the Louvre Mona Lisa who saying "Leonardo's hand" is evident in some aspects of the Isleworth Mona Lisa.

But there are more potent reasons to attach the greatest importance to the new discovery.  There is, in the collection of old master drawings at the Louvre an original pen drawing by Raphael, which is reproduced in Muntz's great work on Leonardo, and which is generally admitted to be a memory sketch by Raphael of Leonardo's "Mona Lisa."  Now this memory sketch is framed at both sides by two columns of which no trace is to be found in the Paris "Mona Lisa." These columns appear in the identical place in the Isleworth picture and are of immense value to the harmonious balance of the composition. 

In the notice sent out to the press it is stated that these columns are mentioned by Vasari, which is as little in accordance with facts as most of the other statements made.  Thus, one of the points quoted in favor of the authenticity of the picture is one of Leonardo's letters to Marshal de Chaumont.  In this letter occurs the passage: "E portar con mecho due quadri di due Notro Donne di varie grandezze le qual son fatte pel cristianissimo notro re."  While most art historians have misread this to mean that Leonardo took with him "two pictures of Our Lady, of different sizes," the writer of the widely circulated notice says that the existence of two versions of the "Mona Lisa" is proved by Leonardo himself referring to two portraits.  A literal translation of the quoted passage would however run as follows: "And take with me two portraits of two of our ladies, of different sizes, which have been painted for our most Christian King", the letter thus reflecting clearly to two different ladies and not to two versions of the same. 

However, no specious arguments are needed for the Isleworth picture, the quality of which may speak for itself.  And a close investigation of the picture leaves the firm conviction that, though not altogether from the hand of Leonardo da Vinci himself, it emanates most certainly from his studio and was very largely worked up by the master himself.  The hands, with their careful and somewhat hard drawing and terra cotta coloring, suggest at once the name of Leonardo's pupil, Marco d'Oggionno, whereas the inimitably soft and lovely painting of the head and bust, the exquisite subtlety of the expression, the golden glow of the general coloring, can be due only to Leonardo.  The face shows none of the defects of the Louvre picture, which are probably due to clumsy repainting. 

The present owner of the picture acquired his treasure only about a year ago.  He found it hidden in a Somerset mansion where it had been for a century and a half, and whither it had been brought from Italy.