Hermitage Museum Andrew W. Mellon acquired 21 works of art from the Hermitage and later donated to form a nucleus of the National Gallery of Art in Washington, D.C. (see also Soviet sale of Hermitage paintings). With the German invasion of the Soviet Union in 1941, before the Siege of Leningrad started, two trains with a considerable part of the collections were evacuated to Sverdlovsk. Two bombs and a number of shells hit the museum buildings during the siege. The museum opened an exhibition in November 1944. In October 1945 the evacuated collections were brought back, and in November 1945 the museum
Hermitage Museum insane attacked Rembrandt's painting "Danaë", displayed in the museum. He threw sulfuric acid on the canvas and cut it twice with his knife. The restoration of the painting had been accomplished by Hermitage experts by 1997, and "Danaë" is now on display behind armoured glass. In 1991, it became known that some paintings looted by the Red Army in Germany in 1945 were held in the Hermitage. Only in October 1994 the Hermitage officially announced that it had secretly been holding a major trove of French Impressionist and Post-Impressionist paintings from German private collections. The exhibition "Hidden Treasures Revealed", where