Paul von Mendelssohn-Bartholdy sold the pastel drawing 'Head of a Woman,' at a loss in 1934 because he feared the Nazis would confiscate his estate

Showing works from collection amassed during World War II and discovered in 2012, Israel Museum attempts to untangle history of quarter-Jewish dealer who thrived under the Nazis

In controversial ruling, Netherlands restitution committee refuses to return a Wassily Kandinsky painting worth millions, citing 'public interest'

Gurlitt collection, which contains many looted works, 'raised touchy questions,' says curator, who wanted to show how visual art was 'instrumentalized by Nazi Germany'