1904. Oil on canvas. The Pushkin Museum of Fine Arts, Moscow, Russia. Another name of the picture is "The Houses of Parliament. A violet Fog". It belongs to a series of paintings of the Palace of Westminster which were produced during Monet's stay in London in 1900-1904. You can see the other canvases here: http://en.wikipedia.org/wiki/Houses_of_Parliament_series_(Monet)