 Complete the following phrase:  Art dealers Hildebrand Gurlitt, Karl Buchholz, Ferdid Moeller and Bernhard Boehmer set up shop in Schloss Niederschonhausen, just outside Berlin, to sell a cache of near-16,000 paintings and sculptures which Hitler and Göring removed from the walls of German museums in 193738. They were first put on display in the Haus der Kunst in Munich on 19 July 1937, with the Nazi leaders inviting public mockery by two million visitors who came to view the condemned modern art in the 