After the prosperity of the 1920s and the economic downturn of the 1930s, World War II brought enormous change to the lives of the super-rich. For some, that meant allowing their stately homes to be used for the war effort, while for others giving up valuable family heirlooms was a small price to pay for safety. Read on to find out how some of the world's richest people lived between 1939 and 1945.