Gustav Klimt's "Portrait of a Lady" drew worldwide attention when it was found in early December at an art gallery in Piacenza, north of Italy. The 60m-euro painting was found right on the wall where it lost its footprint 23 years ago.

When it was discovered, the Italian authorities were skeptical about whether or not the original painting was mentioned, but recently confirmed that yes, the painting found is the Austrian artist's "Portrait of a Lady".

The painting was stolen on February 22, 1997 by the Richie Oddi Modern Art Gallery in Piacenza. Its frame was thrown on the roof of the building, an attempt the thieves made to get the painting out the window.

However, the disappearance of the painting remains a mystery. Associates of Sky TG24 told CNN that the painting may have never left the building, though it had been required for years. Until now, it is not yet known what made the thieves never return. The painting was found by gardeners cleaning the ivy on the outside wall of the gallery.

"Portrait of a Lady" is thought to have been painted by a Viennese artist in 1916-1917, when Klimt was in his final years. What makes his work remarkable is the fact that a few months before it was stolen, an art student, Claudia Maga, discovered at the time that "Portrait of a Lady" was painted above another artist's work, "Portrait of a Lady Re ?(1912). She managed to prove this through an X-ray test.

The original painting showed the portrait of a young girl from Vienna who had died suddenly. Klimt painted another portrait, how to forget the pain of her death.