Halloween originated 2000 years ago in Ireland, England, and Northern France as part of the ancient Celtic festival of Samhain, where people believed spirits of the dead returned to earth on October 31st. To avoid being recognized by ghosts, people wore costumes. The tradition of carving jack-o-lanterns from pumpkins comes from Irish traditions of carving turnips to scare away ghosts. Today, Halloween involves children dressing in costumes and going trick-or-treating to collect candy, carving jack-o-lanterns, and telling scary stories.