Whether it's shadowy figures in dark hallways, objects that move on their own or unexplained chills in an abandoned place, ghosts have fascinated people for centuries.A bump in the night, the creak of floorboards and the uneasy coldness of a room has kept investigators and mediums asking one big question.Are ghosts real?Explore the mysteries of ghosts in this graphic guide and decide for yourself - is there anything hiding in the dark?