Bette Shober (L) and Joanne Vrablik (R) take a closer look at what people believe to be an image of the Virgin Mary under a freeway underpass in Chicago, April 18, 2005. Police said the image might have been caused by stains from road salt that dripped from the Kennedy expressway onto the wall, but hundreds of believers have been coming to the underpass to view the image and pray at the spot. REUTERS/John Gress  ¶ 6:40 PM