A traditional Irish turnip Jack-o'-lantern from the early 20th century, photographed at the Museum of Country Life, Ireland. By Rannpháirtí anaithnid at English Wikipedia, CC BY-SA 3.0.

The history of Samhain, the pagan holiday

Pronounced “SAH-win,” or /saʊɪn/ for those who study the International Phonetic Alphabet, Samhain is a Sabbath from Oct. 31–Nov. 1 to honor ancestors, celebrate the harvest of crops and mark…