Beginning in the late 19th century, images of the devil began popping up on postcards in Austria and Germany, and by 1902 became so popular they proliferated across all of Europe. American postcard manufacturers took note and jumped on the bandwagon, producing their own versions. These penny "dreadfuls" were used to promote a vast array of occasions and products--from festive holiday celebrations, such as Halloween and Christmas (in Europe), to popular...