Halloween has its origins in an ancient Celtic festival celebrating the end of summer, where the Celts believed the spirits of the dead returned to Earth. Nowadays, Halloween is celebrated on October 31st where children dress up in costumes like ghosts and vampires and go door-to-door trick-or-treating, and homes and gardens are decorated with scary symbols like jack-o-lanterns, skeletons, and ghosts. The jack-o-lantern tradition originated from an Irish tale about a man named Jack who was trapped between Heaven and Hell and forced to wander with his lantern until Judgment Day.