Time can be unkind to art, and this was particularly apparent during World War II. Many amazing (and culturally significant) works of art were destroyed in a conflict that leveled cities and destroyed countless lives. Additionally, beyond horrific human cost, World War II was the largest art heist the world has ever seen. Although it is not known exactly how many works of art the Nazis stole from museums, churches, and private collections, estimates range from hundreds of thousands into the millions. This article from Smithsonian Magazine showcases the brave men and women who tried (and often succeeded) to find those stolen works.