Major restoration on Girl reading a Letter at an Open Window shows a large studded goblet later covered by a green curtain

A feature-length film, screening next week in France, sheds new light on the political machinations surrounding the world's most controversial painting

Laboratory tests revealed "sensational" discovery that the figure in Girl Reading a Letter at an Open Window was overpainted decades after the artist’s death

Museum specialist believes he has uncovered the identity of the artist—and his voluptuous muse